WO2021000728A1

WO2021000728A1 - Aramid paper honeycomb composite part, preparation method therefor and use thereof

Info

Publication number: WO2021000728A1
Application number: PCT/CN2020/096447
Authority: WO
Inventors: 邓海; 董雪妍; 金晓明; 金晶; 夏东伟
Original assignee: 中车长春轨道客车股份有限公司
Priority date: 2019-07-02
Filing date: 2020-06-17
Publication date: 2021-01-07
Also published as: CN110181897A; CN110181897B

Abstract

Provided is an aramid paper honeycomb composite part, comprising prepreg cured sheets, an aramid paper honeycomb core and a Honeycon adhesive, wherein the aramid paper honeycomb core is composited between the prepreg cured sheets to form a sandwich structure; and the Honeycon adhesive comprises a Honeycon bonding glue, and the Honeycon bonding glue is bonded between the aramid paper honeycomb core and the prepreg cured sheets. The aramid paper honeycomb composite part provided in the present invention can be composited at a normal temperature in the final composite process by means of combining the pre-prepared prepreg cured sheet with the Honeycon adhesive, which reduces the production time and equipment investment, such that when a finished product is processed, large equipment, such as a hot press, a large vacuum tank, and a high-temperature oven, are no longer needed, thereby reducing the production cost and realizing the industrial mass production of aramid paper honeycomb composite plates. The normal-temperature preparation method provided in the present invention is simple in terms of process and the conditions of same are mild, and same is more suitable for large-scale production and promotion.

Description

Aramid paper honeycomb composite article and preparation method and application thereof

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on July 02, 2019, the application number is 201910590918.9, and the invention title is "an aramid paper honeycomb composite product and its preparation method and application", all of which The content is incorporated in this application by reference.

Technical field

The invention belongs to the technical field of aramid paper honeycomb technology, and relates to an aramid paper honeycomb composite article and a preparation method and application thereof, in particular to an aramid paper honeycomb and a normal temperature preparation method and application thereof.

Background technique

With the rapid development of the global economy, pulp raw materials in the traditional sense can no longer meet the diverse needs of various industries in terms of performance, so various paper-based materials have emerged. The so-called paper-based materials usually refer to non-natural plant fibers ( Man-made fibers (such as carbon fiber or aramid fiber, etc.) are the basic framework materials, which are multifunctional materials produced and shaped by papermaking methods, such as widely used insulating paper, heat-resistant paper and fire-resistant paper.

Among many paper-based materials, aramid paper is a widely used paper-based material. Due to the high strength, high modulus, acid and alkali resistance and light weight of aramid fiber, aramid paper is widely used in aviation, Aerospace, shipbuilding and other national defense fields occupy a pivotal position; at the same time, they are also important materials in civil fields such as railways, electromechanics, electronics, and communications. Aramid paper is often made into various structural forms such as inner radome, secondary stress structural parts, insulation and heat insulation. Among the structural forms commonly used in many fields, due to the excellent mechanical structure of the honeycomb structure, it has been widely used in the fields of force, heat insulation and sound insulation. Therefore, the combination of paper-based materials and honeycomb structures has become a research in the field Subjects of widespread concern to staff.

The honeycomb core is made according to the natural honeycomb structure principle. It uses high-strength and light-weight materials through bonding, stretching and other processes to connect into countless hollow three-dimensional regular hexagonal structures to form an overall force-bearing part. Commonly used honeycomb core materials include aluminum honeycomb core and aramid paper honeycomb core. Although the price of aluminum honeycomb core is lower and the use temperature is higher, due to the relatively high density of aluminum, it is prone to oxidation reaction and has a short service life. It is mainly used for price-sensitive, insensitive to service life and needs to be lightweight. However, the aramid paper-based honeycomb core made of aramid paper is not the case. Its light-weight and high-strength characteristics make it have broad prospects in the field of lightweight sports carriers.

In today’s high-speed and high-efficiency society, more convenient and rapid transportation development is required. Various sports carriers (vehicles) have been designed to be lightweight for energy conservation, environmental protection and high speed. The aramid paper honeycomb in aviation materials has low density and high Strength, no thermal expansion and contraction, no metal fatigue, flame retardant, non-toxic, low temperature resistance and other advantages, and the development of domestic high-speed rail, the same batch of aramid paper honeycomb core parts applied to high-speed rail vehicle interior materials.

However, in the process of converting from aviation to civilian use, the most common production process of aramid honeycomb composite parts is currently hot pressing of steel molds, hot pressing of vacuum tanks, and hot reclaiming of vacuum bags. Large equipment cost is high, and production efficiency is low. Large equipment such as high temperature heat press, large vacuum tank, high temperature oven is required, and it is difficult to achieve mass low-cost production, resulting in expensive products, especially in customized processing. The limitations of aramid paper greatly limit the development and wide application of aramid paper honeycomb composite parts.

Therefore, how to find a suitable aramid paper honeycomb composite part and its production method, solve the above-mentioned shortcomings of the current aramid honeycomb composite part, and broaden the development and application of aramid paper honeycomb composite parts, has become a major issue in the industry. One of the problems that manufacturers need to solve urgently.

Summary of the invention

In view of this, the technical problem to be solved by the present invention is to provide an aramid paper honeycomb composite article and its preparation method and application. The aramid paper honeycomb composite article provided by the present invention adopts a special structure, which not only greatly reduces the cost, but also Moreover, the production efficiency is high, mass production is possible at low cost, the custom processing performance is greatly improved, and it also has better high temperature resistance and mechanical properties.

The invention provides an aramid paper honeycomb composite article, which includes a prepreg cured sheet, an aramid paper honeycomb core and Hanikon glue;

The aramid paper honeycomb core is compounded between the cured prepreg sheets to form a sandwich structure;

The Hanacon glue includes Hanacon adhesive glue;

The Hanikon adhesive is bonded between the aramid paper honeycomb core and the prepreg cured sheet.

Preferably, the Hanikon glue also includes Hanikon edge banding glue;

The Hanikang edge banding glue is used as the edge banding of the aramid paper honeycomb composite part;

The prepreg cured sheet includes glass fiber and/or carbon fiber prepreg cured sheet;

The Hanikang glue can also be filled and embedded in any position of the aramid paper honeycomb composite part;

The aramid paper honeycomb composite article also includes hardware.

Preferably, the arbitrary position includes a position requiring later machining or manual processing;

The processing method includes one or more of size positioning, edge trimming, hole opening and grooving;

The hardware is set at the place where the Hanikang glue is filled with pre-buried or post-buried;

The hardware can also be used in conjunction with the Hanikang glue when installed.

Preferably, the prepreg cured sheet includes a double-layer prepreg cured sheet and/or a multilayer prepreg cured sheet;

The thickness of the double-layer prepreg cured sheet is 0.3 to 0.36 mm;

The thickness of the multilayer cured prepreg sheet is greater than or equal to 0.45 mm;

The resin content of the cured prepreg sheet is 35%-65%;

The volatile content of the cured prepreg sheet is less than or equal to 8%;

The aramid paper honeycomb composite article is an aramid paper honeycomb composite article that can be cured at room temperature.

Preferably, the Hanikang glue, based on the mass percentage of raw materials, includes:

The aramid 1313 mesh fiber is a flocculent fiber cluster aramid 1313 fiber, and the aramid 1313 fiber filaments are interwoven to form a three-dimensional network structure;

The shape of the aramid paper honeycomb core includes one or more of a regular hexagonal honeycomb core, a polygonal honeycomb core, a corrugated honeycomb core, and an overstretched honeycomb core;

The cell size of the aramid paper honeycomb core is 1.83～3.67mm;

The density of the aramid paper honeycomb core is 32～120kg/m ³ ;

The height of the aramid paper honeycomb core is 1 to 860 mm.

The invention provides a method for preparing an aramid paper honeycomb composite article, which comprises the following steps:

1) The aramid paper honeycomb is used as the core material, and the cured prepreg sheet is used as the surface material. The adhesive is bonded by Hanikon adhesive. After the mold is clamped and pressurized and cured, the edge is sealed with Hanikon edge sealing adhesive to obtain Aramid paper honeycomb composite parts.

Preferably, the temperature of the clamping and pressure curing is 25-60°C;

The initial curing time of the clamping and pressure curing is 3 to 48 hours;

The complete curing time of the clamping and pressure curing is 1-7 days;

The pressure of the clamping and pressure curing is 0.1-0.3 MPa;

The prepreg cured sheet is obtained by curing glass fiber and/or carbon fiber prepreg through heat and pressure;

The heat and pressure curing temperature is 120-150°C;

The heat and pressure curing time is 25 to 330 minutes;

The heat and pressure curing pressure is 0.1-0.3 MPa.

Preferably, the pre-treatment step is further included before the bonding;

The pretreatment includes one or more of cutting, sanding, degreasing and dust removal;

The dosage of the Hanacon adhesive is 300-350 g/m2;

After the bonding, it also includes a filling and embedding step;

Before and/or after the edge sealing, it also includes a machining step;

Before obtaining the aramid paper honeycomb composite article, a post-processing step is also included.

Preferably, the filling and embedding step is specifically:

In the position that needs later machining or manual processing, fill with Hanikon adhesive glue for pre-embedding;

The machining steps are specifically:

After one or more steps of size positioning, edge trimming, opening and grooving are carried out on the filling and embedded position of the part, add hardware or add hardware with the use of Hanecon adhesive;

The post-treatment step includes one or more of spray painting, film sticking and fireproof board sticking.

The present invention also provides the aramid paper honeycomb composite article according to any one of the above technical solutions or the aramid paper honeycomb composite article prepared by the preparation method according to any one of the above technical solutions for use in rail transit. Application of high-quality flame-retardant board furniture.

Preferably, the fineness of the aramid 1313 mesh fiber is 1 to 2D;

The aramid 1313 mesh fiber has a microscopic three-dimensional network structure formed by mutual cross-linking of filaments, strips and membranes;

The diameter of the wire is 10-500nm;

The diameter of the strip is 0.5-20 μm;

The diameter of the film is 5-50 μm.

Preferably, the preparation method of the aramid 1313 mesh fiber includes the following steps:

A) Spray the polymerized aramid 1313 slurry into the coagulation liquid, and perform coagulation and sedimentation under stirring conditions to obtain a wet fiber mass;

B) After drying the wet fiber mass obtained in the above steps with hot air, a fluffy aramid 1313 mesh fiber is obtained.

Preferably, the coagulation liquid includes a dimethylacetamide solution;

The sprayed flow rate of the aramid 1313 slurry is less than or equal to 1000 mL/min;

The mass ratio of the aramid 1313 slurry to the coagulation liquid is 1: (2-20);

The solidification and sedimentation time is 5-40 min;

The temperature of the hot air drying is 60-85°C.

Preferably, the epoxy resin includes flame-retardant epoxy resin;

The length of the aramid 1313 mesh fiber is 1-7mm;

The aspect ratio of the aramid 1313 mesh fiber is (50～1000):1;

The silica includes fumed silica powder;

The foamed filler includes hollow glass beads;

The aramid epoxy resin glue includes one or more of aramid epoxy resin edge banding glue, aramid epoxy resin filling glue and aramid epoxy resin molding glue;

In the aramid epoxy resin edge sealant and the aramid epoxy resin filler, the silica is each selected from 3.5 to 5.7 parts by weight based on the mass percentage of raw materials;

In the aramid epoxy resin molding adhesive, the silica is 5.7 to 7.5 parts by weight based on the mass percentage of the raw material.

Preferably, the particle size of the silica is 12 nm to 6 μm;

The density of the aramid epoxy resin edge sealant is 0.6-1.0 g/cm ³ ;

The aramid epoxy resin edge sealing glue is used for edge sealing of lightweight honeycomb composite materials;

The density of the aramid epoxy resin filler is 1.4-1.6 g/cm ³ ;

The aramid epoxy resin filler is used to bond hardware on the resin composite material;

The density of the aramid epoxy resin molding glue is 0.9-1.6 g/cm ³ ;

The aramid epoxy resin molding glue becomes dough-like before curing;

The aramid epoxy resin molding glue is used for molding on the resin composite material.

Preferably, the preparation method of the aramid epoxy resin adhesive includes the following steps:

a) After mixing the aramid 1313 mesh fiber, epoxy resin and silicon dioxide, an aramid epoxy resin adhesive is obtained.

Preferably, in the step a), a foamed filler is further included;

The mixing time is 10-30 min;

The aramid epoxy resin adhesive needs to be added with a curing aid before use;

The curing aids include modified amine curing agents, accelerators and coupling agents;

The mass ratio of the aramid epoxy resin adhesive to the curing aid is 4:1;

The open time of the aramid epoxy resin adhesive is 30-40 minutes.

The invention provides an aramid paper honeycomb composite article, a prepreg cured sheet, an aramid paper honeycomb core and Hanikon glue; the aramid paper honeycomb core is compounded between the prepreg cured sheets to form Sandwich structure; the Hanikang glue is used as the edge banding of the aramid paper honeycomb composite part. Compared with the prior art, the present invention aims at the existing production process of aramid honeycomb composite parts. In the process, there are large energy consumption, high equipment cost, low production efficiency, high temperature hot press, and it is difficult to achieve large quantities and low production efficiency. The cost of production leads to expensive products, especially in the custom processing, there are still big limitations.

The present invention creatively designs a process for aramid paper honeycomb composite parts and its normal temperature preparation method. In the present invention, the aramid paper honeycomb core is pasted between the prepreg cured sheets by using the Hanikon adhesive glue to form a sandwich structure, and the aramid paper honeycomb composite part is obtained. The aramid paper honeycomb composite article provided by the present invention adopts the prepreg cured sheet prepared in advance and the Hanikon glue, and can be composited at room temperature in the final composite process, reducing production time and equipment investment, and making the finished product When processing parts, it is no longer necessary to occupy large equipment such as hot presses, large vacuum tanks, and high temperature ovens, thereby reducing production costs and realizing the industrial production of large quantities of aramid paper honeycomb composite panels. In addition, the prepreg cured sheet is prepared separately in advance, which also frees the prepreg from multiple restrictions such as refrigerated storage and short product shelf life, and can be cured in batches.

The normal temperature preparation method provided by the present invention has simple process and mild conditions, and is more suitable for large-scale production and promotion, and the prepared aramid paper honeycomb composite article effectively maintains the rigidity, flatness and strength of the aramid paper honeycomb core, and has Good flame retardancy, heat preservation and mechanical properties.

The experimental results show that the aramid paper honeycomb composite article prepared by the present invention has better overall performance, with a tensile performance of 1.70-2.40MPa; a flat compression performance of 2.0-3.6MPa; a shearing performance of 0.60-1.30MPa; drum The peel strength is 45～70N*mm/mm; the bending stiffness is 6.0*10 ⁷ ～11.0*10 ⁷ N·mm ² .

Description of the drawings

Figure 1 is an appearance view of the aramid 1313 mesh fiber prepared by the present invention;

Figure 2 is a scanning electron micrograph of the aramid 1313 mesh fiber prepared by the present invention.

Detailed ways

In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the invention.

All the raw materials of the present invention have no special restrictions on their sources, and can be purchased on the market or prepared according to conventional methods well known to those skilled in the art.

There is no particular limitation on the purity of all the raw materials of the present invention, and analytical purity is preferred in the present invention.

The Hanacon glue includes Hanacon adhesive glue;

In principle, the present invention does not have any special restrictions on the definition of the cured prepreg sheet. The definition of the cured prepreg sheet is well known to those skilled in the art, and those skilled in the art can follow the actual production situation, product requirements and quality requirements. For selection and adjustment, the present invention is to ensure the performance of the aramid paper honeycomb composite part, meet the processing requirements, and facilitate mass production. The prepreg cured sheet preferably refers to a sheet after the prepreg is cured by heat and pressure, preferably Prepreg resin cured sheet.

In principle, the present invention has no special restrictions on the selection of the prepreg cured sheet. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The present invention ensures the quality of aramid paper honeycomb composite parts. Performance, meeting processing requirements, and conducive to mass production, the prepreg cured sheet preferably includes glass fiber and/or carbon fiber prepreg cured sheet, more preferably glass fiber or carbon fiber prepreg cured sheet, that is, glass fiber resin prepreg Material curing sheet or carbon fiber resin prepreg curing sheet.

In principle, the present invention has no special restrictions on the structure of the prepreg cured sheet. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention guarantees the quality of aramid paper honeycomb composite parts. Performance, meeting processing requirements, and facilitating mass production, the prepreg cured sheet preferably includes a double-layer prepreg cured sheet and/or a multilayer prepreg cured sheet. Specifically, the thickness of the double-layer prepreg cured sheet is preferably 0.3 to 0.36 mm, more preferably 0.31 to 0.35 mm, and more preferably 0.32 to 0.34 mm. The thickness of the multilayer cured prepreg sheet is preferably greater than or equal to 0.45 mm, more preferably greater than or equal to 0.65 mm, more preferably greater than or equal to 0.85 mm.

In principle, the present invention has no special restrictions on the parameters of the prepreg cured sheet. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention ensures the performance of aramid paper honeycomb composite parts. Performance, meet processing requirements, and facilitate mass production. The resin content of the cured prepreg is preferably 35%-65%, more preferably 40%-60%, and more preferably 45%-55%. The volatile content of the cured prepreg sheet is preferably 8% or less, more preferably 6% or less, and more preferably 4% or less.

The present invention has no special restrictions on the aramid paper honeycomb core, and only a honeycomb core made of aramid paper known to those skilled in the art can be selected and adjusted according to actual production conditions, product requirements and quality requirements. The material of the aramid honeycomb core of the present invention is preferably aramid paper; the honeycomb core is preferably one of regular hexagonal honeycomb cores, polygonal honeycomb cores, corrugated honeycomb cores and overstretched honeycomb cores. There are multiple types, more preferably regular hexagonal honeycomb core, polygonal honeycomb core, corrugated honeycomb core or overstretched honeycomb core, more preferably regular hexagonal honeycomb core.

In principle, the present invention has no special restrictions on the parameters of the aramid paper honeycomb core. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. Performance, meet processing requirements, and facilitate mass production. The cell size of the aramid paper honeycomb core is preferably 1.83 to 3.67 mm, more preferably 2.03 to 3.37 mm, more preferably 2.33 to 3.17 mm, more preferably 2.63 to 3.17 mm. The height of the aramid paper honeycomb core is preferably 1 to 860 mm, more preferably 50 to 600 mm, more preferably 100 to 500 mm, and more preferably 200 to 400 mm. The density of the aramid paper honeycomb core is preferably 32 to 120 kg/m ³ , more preferably 40 to 110 kg/m ³ , more preferably 50 to 100 kg/m ³ , more preferably 60 to 90 kg/m ³ , more preferably It is 70～80kg/m ³ .

In principle, the present invention does not have any special restrictions on the Hanikon glue. The Hanikon glue that is well known to those skilled in the art can be used, and it can be prepared by itself or purchased commercially. Those skilled in the art can according to actual production conditions, product requirements and The quality requirements are selected and adjusted. In order to ensure the performance of the aramid paper honeycomb composite part, meet the processing requirements, and facilitate mass production, the Hanacon adhesive preferably includes Hanacon adhesive, that is, aramid epoxy resin filler . The Hanecon adhesive glue may specifically be Hanecon CP2016 glue.

In the present invention, the aramid paper honeycomb core is compounded between the cured prepreg sheets, that is, the upper and lower surfaces of the aramid paper honeycomb core are compounded with the prepreg cured sheets to form a sandwich-like sandwich structure. In principle, the present invention has no special restrictions on the composite method. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The present invention ensures the performance of aramid paper honeycomb composite parts and satisfies processing requirements. It is required to facilitate mass production, and the composite is preferably adhesive. That is, the Hanikon adhesive is bonded between the aramid paper honeycomb core and the prepreg cured sheet.

In principle, the present invention has no special restrictions on the selection of the Hanikon glue. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention ensures the performance of aramid paper honeycomb composite parts. To meet the processing requirements and facilitate mass production, the Hanikon glue preferably further includes Hanikon edge banding glue, that is, aramid epoxy resin edge banding glue. The Hanecon edge banding glue may specifically be Hanecon CP2015 glue.

In the present invention, the Hanikon edge banding glue is used as the edge banding of the aramid paper honeycomb composite product, that is, the Hanikon edge banding glue is arranged around the sandwich structure to form an edge banding. In principle, the present invention does not specifically limit the amount of the Hanikon edge banding glue. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention is to ensure the quality of aramid paper honeycomb composite parts. Performance, meeting processing requirements, and conducive to mass production, the edge sealing thickness of the Hanikon edge banding glue is preferably 1-8mm, more preferably 2-6mm, more preferably 3-4mm, and more preferably 3.3-3.6mm.

In order to ensure the performance of the aramid paper honeycomb composite part, meet the processing requirements, facilitate mass production, and further facilitate subsequent processing and customization, the Hanikang glue can preferably be filled and embedded in the aramid paper honeycomb composite Any position of the part. The Hanikon glue that is filled and embedded in any position of the aramid paper honeycomb composite article is specifically preferably Hanikon adhesive glue or Hanikon filling molding glue, more preferably Hanikon filling molding glue.

In principle, the present invention does not have any special restrictions on the Hanikon glue. The Hanikon glue that is well known to those skilled in the art can be used, and it can be prepared by itself or purchased commercially. Those skilled in the art can according to actual production conditions, product requirements and Quality requirements are selected and adjusted. In order to ensure the performance of aramid paper honeycomb composite parts, meet the processing requirements, and facilitate mass production, the Hanacon glue preferably includes Hanacon filling molding glue, that is, aramid epoxy resin molding glue . The Hanecon filling molding glue may specifically be Hanecon CP2017 glue.

In the present invention, the arbitrary position preferably includes a position requiring later machining or manual processing. That is to say, if you need to perform machining or manual processing on the aramid paper honeycomb composite part in the future, you can fill the parts that need to be machined or manually processed according to the process drawings with Hanikon adhesive or filling molding glue for pre-embedding. The processing method of the present invention preferably includes one or more of size positioning, edge trimming, hole opening and slotting, and more preferably multiple of size positioning, edge trimming, hole opening and slotting.

The present invention further completes and refines the structure of the aramid paper honeycomb composite article, meets various needs, satisfies the processing requirements, and facilitates mass production. The aramid paper honeycomb composite article preferably further includes hardware. In principle, the present invention does not have any special restrictions on the arrangement of the hardware. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention ensures the performance of aramid paper honeycomb composite parts. To meet processing requirements and facilitate mass production, the hardware is preferably arranged at the place where the embedded Hanikon glue (specifically, Hanikon adhesive glue or Hanikon filling molding glue) is filled.

Further, the hardware can preferably also be used in conjunction with the Hanikang glue when it is installed. The Hanikon glue used in combination in the present invention is specifically preferably Hanikon adhesive glue or Hanikon filling molding glue. When the said aramid paper honeycomb composite parts are machined or hand-processed according to the requirements of the drawings, such as size positioning, edge trimming, hole opening, digging, etc., the molding can be filled with Hanikang glue, and the hardware can be embedded. When used together, the aramid paper honeycomb composite part with Hanikon edge-sealing glue is finally obtained.

In order to further complete and refine the overall technical solution, the present invention guarantees the performance of the aramid paper honeycomb composite parts, meets the processing requirements, is conducive to mass production, and further facilitates subsequent processing customization. It also provides Hanikon glue and its preparation method. That is, an aramid epoxy resin adhesive and a preparation method thereof, and an aramid 1313 mesh fiber used in the aramid epoxy resin adhesive and a preparation method thereof.

The present invention provides an aramid 1313 mesh fiber, wherein the aramid 1313 fiber is a flocculent fiber cluster aramid 1313 fiber;

Aramid 1313 fiber filaments are interwoven to form a three-dimensional network structure.

The present invention has no special restrictions on the definition of aramid 1313. The definition and concept of aramid 1313 well known to those skilled in the art can be used. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. , Can be a kind of polyamide fiber, can be called poly-m-phenylene isophthalamide fiber.

The aramid 1313 mesh fiber of the present invention has a floc-like fiber cluster or a macroscopic morphology similar to a cotton-like fiber cluster, and the aramid 1313 fiber filaments are interwoven to form a 3D three-dimensional space network structure.

In principle, the present invention has no special restrictions on the characteristic parameters of the aramid 1313 mesh fiber. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The present invention ensures that the aramid 1313 mesh fiber It can better improve the performance of the aramid epoxy resin adhesive and meet the processing requirements and quality requirements of aramid paper honeycomb composite parts. The fineness of the aramid 1313 mesh fiber is preferably 1 to 2D, more preferably It is 1.2 to 1.8D, more preferably 1.4 to 1.6D.

In principle, the present invention has no special restrictions on the microstructure of the aramid 1313 mesh fiber. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The present invention ensures that the aramid 1313 mesh fiber It can better improve the performance of aramid epoxy resin adhesive, and meet the processing requirements and quality requirements of aramid paper honeycomb composite parts. At the microscopic level, the aramid 1313 mesh fiber particularly preferably has filaments and strips. The microscopic three-dimensional network structure formed by cross-linking between the shape and the film. In the present invention, the filaments, strips and membranes are all composed of aramid 1313, aramid 1313 filaments have a thin filament shape, and the aramid 1313 strips can be strips after crimping the aramid 1313 film, or The aramid 1313 filaments are twisted together to form a strip, while the aramid 1313 film has the typical two-dimensional characteristics of the film, with a larger sheet diameter and a thinner thickness.

In principle, the present invention does not specifically limit the microstructure parameters of the aramid 1313 mesh fiber. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention ensures that the aramid 1313 mesh The performance of the fiber can better improve the performance of the aramid epoxy resin adhesive and meet the processing requirements and quality requirements of aramid paper honeycomb composite parts. The diameter of the filament is preferably 10-500nm, more preferably 50-400nm, It is more preferably 100 to 300 nm, and more preferably 150 to 200 nm. The diameter of the bar is preferably 0.5 to 20 μm, more preferably 3 to 18 μm, more preferably 5 to 15 μm, and more preferably 8 to 12 μm. The diameter of the film is preferably 5 to 50 μm, more preferably 15 to 40 μm, and even more preferably 25 to 30 μm.

The present invention also provides a method for preparing aramid 1313 mesh fiber, which includes the following steps:

B) After the wet fiber mass obtained in the above steps is dried with hot air, a fluffy aramid 1313 mesh fiber is obtained.

The present invention can correspond to the parameters, selection and structure in the above-mentioned preparation method, and the corresponding optimization principle, and the parameters, selection and structure relationship in the aforementioned aramid 1313 mesh fiber, and the corresponding optimization principle. Go into details one by one.

In the present invention, the polymerized aramid 1313 slurry is sprayed into the coagulation liquid, and coagulation and sedimentation are carried out under stirring conditions to obtain a wet fiber mass.

The present invention has no special restrictions on the polymerization method and process. The conventional polymerization method and process for preparing aramid 1313 well known to those skilled in the art can be used according to actual production conditions, product requirements and quality requirements. Selection and adjustment.

In principle, the present invention has no special restrictions on the injection method and parameters of the aramid 1313 slurry. Those skilled in the art can select and adjust according to the actual production situation, product requirements and quality requirements. The present invention guarantees that the aramid 1313 mesh The performance of the fiber-like fiber can better improve the performance of the aramid epoxy resin adhesive and meet the processing requirements and quality requirements of aramid paper honeycomb composite parts. The injection method is preferably high-pressure spray formed by a platinum nozzle. . The sprayed flow rate of the aramid 1313 slurry of the present invention is preferably less than or equal to 1000 mL/min, more preferably less than or equal to 800 mL/min, more preferably less than or equal to 500 mL/min, and can be 1 to 1000 mL/min, and can be 300 to 800 mL/min. min, can be 500-600mL/min.

In principle, the present invention has no special restrictions on the selection of the coagulation liquid. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The present invention is to ensure the performance of aramid 1313 mesh fibers. To improve the performance of the aramid epoxy resin adhesive and meet the processing requirements and quality requirements of aramid paper honeycomb composite parts, the coagulation liquid, that is, the precipitating agent, preferably includes dimethylacetamide (DMAc) solution, more preferably It is a dimethylacetamide solution with a mass content of 45% to 55% (wherein, the mass content can also be 47% to 53%, or 49% to 51%). The dimethylacetamide solution of the present invention can be specifically 45%-55% dimethylacetamide, 0-1% polar solvent (such as lithium chloride) and 44%-54% water. Among them, the polar solvent can also be 0.2% to 0.8%, or 0.4% to 0.6%; water can also be 46% to 52%, or 48% to 50%.

In principle, the present invention does not specifically limit the amount of the coagulation liquid. Those skilled in the art can select and adjust according to the actual production situation, product requirements and quality requirements. The present invention ensures the performance of the aramid 1313 mesh fiber. To improve the performance of the aramid epoxy resin adhesive and meet the processing requirements and quality requirements of aramid paper honeycomb composite parts, the mass ratio of the aramid 1313 slurry to the coagulation liquid is preferably 1: (2-20), more Preferably it is 1: (5-18), more preferably 1: (7-15), and more preferably 1: (10-13).

In principle, the present invention has no special restrictions on the state of coagulation and sedimentation. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention ensures the performance of aramid 1313 mesh fibers. It can improve the performance of aramid epoxy resin adhesive and meet the processing requirements and quality requirements of aramid paper honeycomb composite parts. The coagulation sedimentation, that is, sedimentation, is the result of the aramid slurry being coagulated into fibrous filaments. The state preferably means that the aramid 1313 slurry has been coagulated into an aramid 1313 fiber shape after spinning.

In principle, the present invention has no special restrictions on the specific parameters of coagulation and precipitation. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The present invention is to ensure the performance of aramid 1313 mesh fibers. Better improve the performance of the aramid epoxy resin adhesive and meet the processing requirements and quality requirements of aramid paper honeycomb composite parts. The solidification and sedimentation time, that is, the stirring time or the time in the coagulation liquid, is preferably 5 ~ 40 min, more preferably 10 to 35 min, more preferably 15 to 30 min, more preferably 20 to 25 min.

In the present invention, after the wet fiber mass obtained in the above steps is dried by hot air, a fluffy aramid 1313 mesh fiber is obtained.

In principle, the present invention has no special restrictions on the specific parameters of the hot air drying. Those skilled in the art can select and adjust according to the actual production situation, product requirements and quality requirements. The present invention ensures the performance of the aramid 1313 mesh fiber. To improve the performance of the aramid epoxy resin adhesive and meet the processing requirements and quality requirements of aramid paper honeycomb composite parts, the hot air drying temperature is preferably 60-85°C, more preferably 65-80°C, more preferably It is 70～75℃.

In the present invention, after the above steps, the aramid slurry after the polymerization reaction is sprayed into the coagulation bath through the platinum nozzle high pressure spray, and under the condition of stirring, the wet flocculent fiber cluster is formed on the stirring device or the rod medium, and then The obtained wet fiber mass is dried and fluffed through a large-scale hot-air drying device, and then the aramid 1313 mesh fiber is obtained in which the fiber filaments are interwoven to form a three-dimensional network structure.

The invention also provides an aramid epoxy resin adhesive, which is calculated as a percentage of the mass of the raw material, and includes:

In principle, the present invention does not specifically limit the specific selection of the epoxy resin. Those skilled in the art can select and adjust according to the actual production situation, product requirements and quality requirements. The present invention ensures the performance of the aramid epoxy resin adhesive. To meet the processing requirements and quality requirements of the aramid paper honeycomb composite product, the epoxy resin preferably includes a flame-retardant epoxy resin.

In principle, the present invention has no special restrictions on the amount of epoxy resin added. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention ensures the performance of aramid epoxy resin adhesives. To meet the processing requirements and quality requirements of the aramid paper honeycomb composite product, the epoxy resin is preferably added in an amount of 90 to 94 parts by weight, more preferably 90.5 to 93.5 parts by weight, more preferably 91 to 93 parts by weight, and more Preferably it is 91.5-92.5 parts by weight.

In principle, the present invention has no special restrictions on the specific selection of the silica. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention ensures the performance of the aramid epoxy resin adhesive. To meet the processing requirements and quality requirements of the aramid paper honeycomb composite product, the silica preferably includes fumed silica powder. The particle size of the silica is preferably 12 nm to 6 μm, more preferably 50 nm to 1 μm, more preferably 100 to 800 nm, more preferably 150 to 600 nm, and more preferably 200 to 400 nm.

In principle, the present invention does not have special restrictions on the amount of silica added. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention ensures the performance of aramid epoxy resin adhesive. To meet the processing requirements and quality requirements of the aramid paper honeycomb composite article, the added amount of silica is preferably 3.5 to 7.5 parts by weight, more preferably 4 to 7 parts by weight, more preferably 4.5 to 6.5 parts by weight, and more Preferably it is 5-6 weight parts.

In principle, the present invention does not specifically limit the specific selection of the foamed filler. Those skilled in the art can select and adjust according to the actual production situation, product requirements and quality requirements. The present invention ensures the performance of the aramid epoxy resin adhesive. To meet the processing requirements and quality requirements of the aramid paper honeycomb composite article, the foamed filler preferably includes hollow glass beads, more preferably single-density hollow glass beads or hollow glass beads with different densities. The foamed filler of the present invention is preferably used to adjust the density of the aramid epoxy resin glue.

In principle, the present invention has no special restrictions on the amount of foam filler added. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The present invention ensures the performance of the aramid epoxy resin adhesive. , To meet the processing requirements and quality requirements of aramid paper honeycomb composite parts, the added amount of the foamed filler is preferably 0-10 parts by weight, more preferably 2-8 parts by weight, more preferably 4-6 parts by weight .

In principle, the present invention has no special restrictions on the specific parameters of the aramid 1313 mesh fiber. Those skilled in the art can select and adjust according to the actual production situation, product requirements and quality requirements. The present invention ensures that the aramid epoxy resin adhesive The performance of the aramid paper honeycomb composite product meets the processing requirements and quality requirements of the aramid paper honeycomb composite product. The length of the aramid 1313 mesh fiber is preferably 1-7 mm, more preferably 2-6 mm, and more preferably 3-5 mm. The aspect ratio of the aramid 1313 mesh fiber is preferably (50-1000):1, more preferably (250-800):1, and more preferably (450-600):1.

In principle, the present invention has no special restrictions on the amount of aramid 1313 mesh fiber added. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The performance of the aramid paper honeycomb composite product meets the processing requirements and quality requirements of the aramid paper honeycomb composite product. The added amount of the aramid 1313 mesh fiber is preferably 0.3 to 0.5 parts by weight, more preferably 0.32 to 0.48 parts by weight, and more preferably 0.35 ~0.45 parts by weight, more preferably 0.38 to 0.42 parts by weight.

In the present invention, in order to complete and refine the technical solution, to ensure the performance of the aramid epoxy resin adhesive, it not only meets the processing requirements and quality requirements of the aramid paper honeycomb composite parts, but also further meets the various requirements of the composite parts The types of the aramid epoxy resin adhesive preferably include one or more of aramid epoxy resin edge sealant, aramid epoxy resin filler and aramid epoxy resin molding adhesive, and more preferably include aramid Epoxy resin edge banding glue, aramid epoxy resin filling glue and aramid epoxy resin molding glue.

In principle, the present invention has no special restrictions on the composition of the aramid epoxy resin edge sealant. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The performance of the glue satisfies the various processing requirements and high quality requirements of composite parts. In the aramid epoxy resin edge banding glue, the amount of silica added is preferably 3.5-5.7 by weight based on the mass percentage of raw materials. Parts, more preferably 3.8 to 5.5 parts by weight, more preferably 4.0 to 5.3 parts by weight, still more preferably 4.2 to 5.0 parts by weight.

The aramid epoxy resin edge banding glue of the present invention preferably controls the density, and the density of the aramid epoxy resin edge banding glue is preferably 0.6 to 1.0 g/cm ³ , more preferably 0.65 to 0.95 g/cm ³ , More preferably 0.7 to 0.9 g/cm ³ , more preferably 0.75 to 0.85 g/cm ³ . The aramid epoxy resin edge sealing glue of the present invention is preferably used for edge sealing of lightweight honeycomb composite materials.

In principle, the present invention has no special restrictions on the composition of the aramid epoxy resin filler. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The performance of the composite parts meets the various processing requirements and high quality requirements of composite parts. In the aramid epoxy resin edge banding glue, the added amount of silica is preferably 3.5 to 5.7 parts by weight based on the mass percentage of the raw material , More preferably 3.8 to 5.5 parts by weight, more preferably 4.0 to 5.3 parts by weight, still more preferably 4.2 to 5.0 parts by weight.

The aramid epoxy resin filler of the present invention preferably controls the density. The density of the aramid epoxy resin filler is preferably 1.4 to 1.6 g/cm ³ , more preferably 1.42 to 1.58 g/cm ³ , and more It is preferably 1.45 to 1.55 g/cm ³ , more preferably 1.48 to 1.53 g/cm ³ . The aramid epoxy resin filler of the present invention is preferably used for bonding hardware on resin composite materials.

In principle, the present invention has no special restrictions on the composition of the aramid epoxy resin molding adhesive. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The present invention ensures that the aramid epoxy resin adhesive The performance of the composite parts meets the various processing requirements and high quality requirements. The aramid epoxy resin molding glue preferably controls the amount of silica added. The amount of silica added is calculated by the mass percentage of the raw material. The amount is preferably 5.7 to 7.5 parts by weight, more preferably 6.0 to 7.3 parts by weight, more preferably 6.2 to 7.0 parts by weight, and more preferably 6.4 to 6.8 parts by weight.

The density of the aramid epoxy resin filler of the present invention is preferably 0.9 to 1.6 g/cm ³ , more preferably 1.0 to 1.5 g/cm ³ , more preferably 1.1 to 1.4 g/cm ³ , and more preferably 1.2 to 1.3g/cm ³ . The aramid epoxy resin molding glue of the present invention preferably has a dough-like morphology before curing; the aramid epoxy resin molding glue is preferably used for molding on resin composite materials.

The invention obtains an aramid 1313 mesh fiber, which has a flocculent fiber cluster shape, and the aramid 1313 fiber filaments are interwoven to form a three-dimensional network structure. In the present invention, it is used in epoxy resin glue to obtain an aramid epoxy resin glue. Aramid 1313 mesh fiber is added to the epoxy resin glue, similar to the principle of cement and steel reinforcement, so that the epoxy resin glue is cured After that, it has better bonding properties such as better compression resistance, shear resistance, crack resistance, and low temperature resistance. The aramid epoxy resin adhesive is a series of flame-retardant epoxy resin structural adhesives. It not only has good bonding performance, but also can be used for edge banding and molding by adjusting the components and physical parameters, thereby satisfying multiple requirements. Demand. Aramid epoxy resin adhesive can be cured at room temperature and has good performance. It can meet the relevant standards of aramid paper honeycomb composite parts, thereby solving the cumbersome process of preparing aramid honeycomb composite parts. Defects such as high cost.

The present invention also provides a method for preparing the aramid epoxy resin adhesive according to any one of the above technical solutions, including the following steps:

In the preparation method of the aramid epoxy resin adhesive of the present invention, the specific preferred options of the raw materials, and the preferred number of additions and the specific preferred options of the components in the aforementioned aramid epoxy resin adhesive, and the number of additions The preferred values of are all the same, so I won’t repeat them here.

The present invention is a complete and detailed technical solution to ensure the performance of aramid epoxy resin adhesive, not only to meet the processing requirements and quality requirements of aramid paper honeycomb composite parts, but also to further meet the various needs of composite parts. Step a) preferably further includes foamed fillers, that is, the raw materials are preferably aramid 1313 mesh fibers, epoxy resin, foamed fillers and silica. Specifically, the step a) may specifically be:

After mixing the aramid 1313 mesh fiber, epoxy resin, foaming filler and silica, an aramid epoxy resin adhesive is obtained.

In principle, the present invention has no special restrictions on the specific parameters of the mixing. Those skilled in the art can select and adjust according to the actual production situation, product requirements and quality requirements. The present invention ensures the performance of the aramid epoxy resin adhesive and meets the According to the processing requirements and quality requirements of the fiber-paper honeycomb composite article, the mixing time is preferably 10-30 min, more preferably 12-28 min, more preferably 15-25 min, and more preferably 18-22 min.

In the present invention, in order to complete and refine the technical solution, to ensure the performance of the aramid epoxy resin adhesive, it not only meets the processing requirements and quality requirements of the aramid paper honeycomb composite parts, but also further meets the various requirements of the composite parts , The aramid epoxy resin adhesive needs to be added with a curing aid before being used. In principle, the present invention has no special restrictions on the specific selection and proportion of the curing aids. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The performance meets the processing requirements and quality requirements of the aramid paper honeycomb composite article. The curing aid preferably includes a modified amine curing agent, an accelerator and a coupling agent. The mass ratio of the aramid epoxy resin adhesive to the curing aid is preferably 4:1.

The present invention is a complete and detailed technical solution to ensure the performance of the aramid epoxy resin adhesive, and is more conducive to actual use when meeting the processing requirements and quality requirements of aramid paper honeycomb composite parts. The open time of the glue is preferably 30-40 min, more preferably 32-38 min, more preferably 34-36 min. The open time is the gluing time after mixing the A and B components of the aramid epoxy resin glue, including the mixing and gluing time. In the present invention, after the open time, the colloid gradually becomes viscous and hardens.

The aramid 1313 mesh fiber provided by the above steps of the present invention and a preparation method thereof, a normal temperature curing aramid flame-retardant epoxy resin structural adhesive series and a preparation method thereof, and an aramid paper honeycomb composite article. The present invention adopts a specific aramid 1313 mesh fiber, which has a floc-like fiber cluster shape, and the aramid 1313 fiber filaments are interwoven to form a three-dimensional network structure. In the present invention, it is used in epoxy resin glue to obtain an aramid epoxy resin glue. Aramid 1313 mesh fiber is added to the epoxy resin glue, similar to the principle of cement and steel reinforcement, so that the epoxy resin glue is cured After that, it has better bonding properties such as better compression resistance, shear resistance, crack resistance, and low temperature resistance. The aramid epoxy resin adhesive is a series of flame-retardant epoxy resin structural adhesives. It not only has good bonding performance, but also can be used for edge banding and molding by adjusting the components and physical parameters, thereby satisfying multiple requirements. Demand. Aramid epoxy resin adhesive can be cured at room temperature and has good performance. It can meet the relevant standards of aramid paper honeycomb composite parts, thereby solving the cumbersome process of preparing aramid honeycomb composite parts. Defects such as high cost.

Experimental results show that the aramid epoxy resin adhesive provided by the present invention has a colloidal Shore hardness of 85-95D after being fully cured, and the compressive strength of the cured rubber block is greater than or equal to 55-65MPa; the tensile force of the 10mm deep M6 screw is greater than or equal to 2000N; The strength (60°C for 3 days, 25°C for 7 days at room temperature) is greater than or equal to 10-15MPa.

The invention also provides a method for preparing the aramid paper honeycomb composite article, which includes the following steps:

In the present invention, the parameters, selection and structural relationship of the required materials in the above-mentioned aramid paper honeycomb composite article, and the corresponding optimization principle, and the parameters, selection and structural relationship in the aforementioned aramid paper honeycomb composite article, and the corresponding optimization The principles can be corresponded, so I won’t repeat them here.

In principle, the present invention does not specifically limit the source of the prepreg cured sheet. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention is to ensure the quality of aramid paper honeycomb composite parts. Performance, meeting processing requirements, and facilitating mass production, the prepreg cured sheet is particularly preferably obtained from glass fiber and/or carbon fiber prepreg after heat and pressure curing. Specifically:

Put the double (multi-layer) glass fiber or carbon fiber prepreg into a hot press for curing to form a prepreg cured sheet.

More specific steps can be:

Wipe and clean the mold with solvent and check the flatness of the mold. Coat the contact surface between the prepreg and the mold with a release agent, lay two or more layers of prepreg in the mold evenly, close the mold and put it into the hot press. First, perform the first heating and insulation under the first pressure, then perform the second heating and insulation under the second pressure, and finally perform the third heating and insulation under the third pressure, and then take it out of the mold after cooling. Prepare prepreg cured sheet.

The present invention has no special restrictions on the process parameters in the above steps. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The process parameters in the above steps of the present invention are based on the material and number of layers of the prepreg. And product requirements for selection and adjustment.

In principle, the present invention does not particularly limit the parameters of the heat and pressure curing. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The present invention is to ensure the performance of aramid paper honeycomb composite parts. To meet processing requirements and facilitate mass production, the temperature of the heat and pressure curing is preferably 120-150°C, more preferably 125-145°C, and more preferably 130-140°C. The pressure of the thermo-pressurized curing of the present invention is preferably 0.1 to 0.3 MPa, more preferably 0.12 to 0.28 MPa, more preferably 0.15 to 0.25 MPa, and more preferably 0.18 to 0.22 MPa. The heat and pressure curing time of the present invention is preferably 25 to 330 minutes, more preferably 60 to 300 minutes, more preferably 120 to 240 minutes, and more preferably 150 to 210 minutes.

In the present invention, the prepreg cured sheet is prepared separately, so that the prepreg can get rid of multiple restrictions such as refrigerated storage and short product shelf life. The prepreg can be cured in batches, so that the hot press is no longer needed in the processing of finished parts. , Thereby reducing production costs and achieving mass production.

In principle, the present invention has no special restrictions on the bonding process. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention guarantees the performance of the aramid paper honeycomb composite parts and meets Processing requirements are conducive to mass production, and the bonding process preferably refers to the bonding standard DIN6701.

In order to further refine and complete the preparation process, the present invention ensures the performance of the aramid paper honeycomb composite part, meets the processing requirements, and facilitates mass production, especially the above-mentioned bonding process is refined, and the pretreatment step is preferably included before the bonding . The pretreatment preferably includes one or more of cutting, sanding, oil removal and dust removal, and more preferably cutting, sanding, oil removal and dust removal.

The specific steps of the above bonding can be the following steps:

For cutting aramid paper honeycomb sheets and prepreg cured sheets, there must be a corresponding size margin. According to the bonding standard DIN6701, the prepreg cured sheet should be polished on both sides (if there is a prepreg splicing seam that needs to be polished smooth), use acetone or alcohol solvent to scrub to remove oil and dust.

The specific steps of the above bonding can be the following steps:

Confirm the mixing ratio of Hanikang adhesive glue, strictly weigh the A and B components, and fully stir and mix the glue. After the A and B components are mixed, the appropriate operation time is about 30 minutes, and the gel hardens over time.

In principle, the present invention does not have special restrictions on the bonding parameters. Those skilled in the art can select and adjust according to actual production conditions, product requirements and quality requirements. The present invention ensures the performance of the aramid paper honeycomb composite parts and meets Processing requirements are conducive to mass production. The dosage of the Hanikon adhesive for bonding is preferably 300-350 g/m², more preferably 310-340 g/m², more preferably 320-330 g/m² .

In principle, the present invention has no special restrictions on the parameters of the clamping and pressurizing and curing. Those skilled in the art can select and adjust according to the actual production situation, product requirements and quality requirements. The present invention is to ensure the performance of the aramid paper honeycomb composite parts. The performance meets the processing requirements and is conducive to mass production. The pressure of the clamping and pressure curing is preferably 0.1 to 0.3 MPa, more preferably 0.12 to 0.28 MPa, more preferably 0.15 to 0.25 MPa, and more preferably 0.18 to 0.22 MPa. The temperature of the clamping and pressure curing is preferably 25 to 60°C, more preferably 30 to 55°C, more preferably 35 to 50°C, and more preferably 40 to 45°C. The time of clamping and pressing and curing includes two concepts: preliminary curing time and/or complete curing time. Wherein, the initial curing time of the clamping and pressure curing is preferably 3 to 48 hours, more preferably 12 to 36 hours, and more preferably 18 to 30 hours. The complete curing time of the clamping and pressure curing is preferably 1 to 7 days, more preferably 2 to 6 days, and more preferably 3 to 5 days. In the present invention, when the mold clamping and pressure curing temperature is 25 to 35° C., the initial curing time of the mold clamping and pressure curing is preferably 24 hours or more, more preferably 36 hours or more, and more preferably Equal to 48 hours. When the mold clamping and pressure curing temperature is a high temperature of 50-60° C., the initial curing time of the mold clamping and pressure curing is preferably 3 hours or more, more preferably 5 hours or more, and more preferably 8 hours or more. Similarly, when the mold clamping and pressure curing temperature is 25 to 35° C., the complete curing time of the mold clamping and pressure curing is preferably 7 days or more, more preferably 9 days or more, and more preferably 12 days or more. day. When the mold clamping pressure curing temperature is a high temperature of 50-60° C., the complete curing time of the mold clamping pressure curing is preferably 1 day or more, more preferably 2 days or more, and more preferably 3 days or more.

In principle, the present invention does not specifically limit the amount of the Hanikon edge banding glue. Those skilled in the art can make selections and adjustments according to actual production conditions, product requirements and quality requirements. The present invention is to ensure the quality of aramid paper honeycomb composite parts. Performance meets processing requirements and is conducive to mass production. The amount of the Hanikon edge banding glue is preferably related to the thickness of the edge banding of the composite part. The edge sealing thickness of the Hanikon edge banding glue is preferably 1-8mm, more preferably 2-6mm, more preferably 3-4mm, and more preferably 3.3-3.6mm.

In order to further refine and complete the preparation process, ensure the performance of the aramid paper honeycomb composite part, meet processing requirements, and facilitate mass production, the invention preferably further includes a pretreatment step after bonding. The filling and embedding step is specifically preferably:

In the position that needs later machining or manual processing, fill with Hanikon glue for pre-embedding.

More specifically, it can be:

According to the process drawings, the parts that need to be drilled, grooved, etc. are filled with Hanikon adhesive for pre-embedding.

In order to further refine and complete the preparation process, ensure the performance of the aramid paper honeycomb composite product, meet the processing requirements, and facilitate mass production, the invention preferably further includes a machining step before and/or after the edge sealing. The machining step is specifically preferably:

After one or more steps of size positioning, edge trimming, hole opening and grooving are carried out on the filling and embedded position of the part, the hardware is added or the hardware is added with the use of Hanikon glue.

More specifically, it can be:

After demolding, the parts are processed for size positioning, edge trimming, hole drilling, grooving, and hardware is installed or installed with the use of Hanikon adhesive.

In order to further refine and complete the preparation process, ensure the performance of the aramid paper honeycomb composite article, meet processing requirements, and facilitate mass production, the present invention preferably further includes a post-processing step before obtaining the aramid paper honeycomb composite article. The post-treatment step preferably includes one or more of spray painting, film sticking and fireproofing board (preferably a thermosetting resin impregnated paper high-pressure laminate).

In the present invention, in order to further refine and complete the preparation process, ensure the performance of the aramid paper honeycomb composite article, meet processing requirements, and facilitate mass production, the specific preparation process of the above aramid paper honeycomb composite article may include the following steps:

Step 1: Put the double (multi-layer) glass fiber or carbon fiber prepreg into the hot press for curing to form a prepreg cured sheet;

Step 2: Cut the aramid paper honeycomb sheet and the prepreg cured sheet, and leave the corresponding size margin. According to the bonding standard DIN6701, the prepreg cured sheet should be polished on both sides (if there is a prepreg splicing seam, it needs to be polished smoothly), and wiped with acetone or alcohol solvent to remove oil and dust

Step 3: Confirm the mixing ratio of Hanikon adhesive glue, strictly weigh the A and B components, and fully stir and mix the glue. After the A and B components are mixed, the appropriate operation time is about 30 minutes, and the gel hardens over time.

Step 4: According to the process drawings, fill the parts that need to be drilled, grooved, etc. to be machined with Hanikon adhesive for pre-embedding.

Step 5: For each layer, apply the Hanikon adhesive at an amount of 300-350g/m ^2. After closing the mold, the flat part is pressurized by 0.1 ~ 0.2 MPa, and the arc part is pressurized by 0.2 ~ 0.3 MPa. Pressure curing (at least 24 hours at 25°C, and initial curing at 60°C for at least 3 hours).

Step 6: After demolding, the parts are processed for size positioning, edge trimming, opening, digging, filling and bonding with Hanikon adhesive (if necessary), and aramid paper honeycomb composite after edge sealing with Hanikon structural adhesive Parts.

Step 7: The aramid paper honeycomb composite article obtained in step 6 is coated, filmed or pasted with a fireproof board (thermosetting resin impregnated paper high-pressure laminate) to obtain a light weight suitable for use in the interior decoration of Chinese standard EMUs. Quantify partition cabinet panels.

The present invention also provides the aramid paper honeycomb composite article according to any one of the above technical solutions or the aramid paper honeycomb composite article prepared by the preparation method of any one of the above technical solutions in terms of lightweight panel furniture application.

In principle, the present invention has no special restrictions on the specific selection of the lightweight panel furniture. The concept of panel furniture in a broad sense that is well known to those skilled in the art can be used. Those skilled in the art can choose according to the use situation, environmental requirements and performance requirements. In addition, the lightweight panel furniture of the present invention is more preferably a lightweight panel furniture on a sports carrier, and specifically can be high-speed rail train interiors, partitions, cabinets, etc.

The above steps of the present invention provide an aramid paper honeycomb and its normal temperature preparation method and application. In the present invention, the aramid paper honeycomb core is pasted between the cured prepreg sheets by using the Hanikon adhesive glue to form a sandwich structure, and then the aramid paper honeycomb composite part is edge-sealed by using the Hanikon edge sealing glue to obtain Aramid paper honeycomb composite parts. The aramid paper honeycomb composite article provided by the present invention adopts the prepreg cured sheet prepared in advance and the Hanikon glue, and can be composited at room temperature in the final composite process, reducing production time and equipment investment, and making the finished product When processing parts, it is no longer necessary to occupy large equipment such as hot presses, large vacuum tanks, and high temperature ovens, thereby reducing production costs and realizing the industrial production of large quantities of aramid paper honeycomb composite panels. Moreover, the use of Hanikon glue for edge sealing can directly produce batches of panels, and the comprehensive use of Hanikon glue for bonding, edge sealing and landfilling can produce various batches of panels. At the same time, during post-custom processing and customer self-processing, Hanikon glue can also be used for edge banding and post-processing to obtain customized finished plates, which is also conducive to batch industrial production and solves the limitations of custom processing. In addition, the prepreg cured sheet is prepared separately in advance, which also frees the prepreg from multiple restrictions such as refrigerated storage and short product shelf life, and can be cured in batches.

In order to further illustrate the present invention, an aramid paper honeycomb composite article provided by the present invention and its preparation method and application are described in detail below in conjunction with examples, but it should be understood that these examples are based on the technical solution of the present invention. The following implementations give detailed implementation and specific operating procedures, just to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention, the protection scope of the present invention is not limited to the following embodiments .

Example 1

1) The polymerized aramid 1313 slurry is sprayed into the coagulation liquid through a platinum nozzle to form a high-pressure spray. The coagulation liquid is a precipitating agent, which is a 50% dimethylacetamide (DMAc) solution and 50% ionized water. The mixed liquid, the flow rate of aramid 1313 slurry sprayed into is 500mL/min. Stir while spraying, and synchronously add the coagulation liquid into the sedimentation tank at a flow of 3000 mL/min. After 30 minutes of coagulation and sedimentation of the aramid 1313 slurry, a wet fiber mass is obtained.

2) The wet fiber mass is sent to a dryer and dried by hot air at 60° C. for 30 minutes to obtain fluffy aramid 1313 mesh fibers.

The aramid 1313 mesh fiber prepared in Example 1 of the present invention was tested.

See Table 1, which is the performance data of the aramid 1313 mesh fiber prepared by the present invention.

Table 1

The aramid 1313 mesh fiber prepared in Example 1 of the present invention was characterized.

Refer to Fig. 1, which is an appearance diagram of the aramid 1313 mesh fiber prepared by the present invention.

It can be seen from Figure 1 that the aramid 1313 mesh fiber prepared by the present invention has a flocculent fiber cluster, or a macroscopic morphology of a cotton-like fiber cluster, and the aramid 1313 fiber filaments are interwoven to form a 3D three-dimensional space. grid.

Refer to Figure 2, which is a scanning electron micrograph of the aramid 1313 mesh fiber prepared by the present invention.

It can be seen from Figure 2 that the aramid 1313 mesh fiber prepared by the present invention has a microscopic three-dimensional network structure formed by mutual cross-linking of filaments, strips and membranes.

Example 2 (Preparation of Hanacon CP2015)

a) After purchasing 90% of A-component epoxy resin, 0.5% of aramid 1313 mesh fiber, 4.5% of silica, and 5.0% of foaming filler, the A-component aramid epoxy resin glue is obtained.

The mixing time is 30 min.

b) Purchase B-component epoxy resin (curing agent).

The mass ratio of the A-component aramid epoxy resin adhesive to the B-component curing aid is preferably 4:1.

The A and B components were stirred and mixed at a mass ratio of 4:1 for 10 minutes to make a test sample.

The performance of the sample block prepared in Example 2 of the present invention was tested.

See Table 2. Table 2 is the performance data of the aramid epoxy resin edge sealant prepared in Example 2 of the present invention.

Table 2 Test data of samples of aramid epoxy resin edge banding glue (Hanikang CP2015)

完全固化胶体硬度Hardness of fully cured colloid	邵氏：≥85DShaw: ≥85D
固化胶块压缩强度Compressive strength of cured rubber block	≥55MPa≥55MPa
完全固化胶体密度Density of fully cured colloid	1.0克/cm ³ 1.0 g/cm ³
剪切强度(MPa)Shear strength (MPa)	≥10MPa(60℃保温3天，25℃常温7天)≥10MPa (3 days at 60℃, 7 days at 25℃ normal temperature)

Example 3 (Preparation of Hanecon CP2016)

a) After purchasing 94% of A-component epoxy resin, 0.3% of aramid 1313 mesh fiber, and 5.7% of silicon dioxide, they are mixed to obtain A-component aramid epoxy resin glue.

The mixing time is 30 min.

b) Purchase B-component epoxy resin (curing agent).

The performance of the sample block prepared in Example 3 of the present invention was tested.

See Table 3, which is the performance data of the aramid epoxy resin filler prepared in Example 3 of the present invention.

Table 3 Test data of samples of aramid epoxy resin filler (Hanikang CP2016)

完全固化胶体硬度Hardness of fully cured colloid	邵氏：≥92DShaw: ≥92D
固化胶块压缩强度Compressive strength of cured rubber block	≥63MPa≥63MPa
完全固化胶体密度Density of fully cured colloid	≦1.5克/cm ³ ≦1.5g/cm ³
剪切强度(MPa)Shear strength (MPa)	≥15MPa(60℃保温3天，25℃常温7天)≥15MPa (3 days at 60℃, 7 days at 25℃ normal temperature)

Example 4 (Preparation of Hanacon CP2017)

a) After purchasing 92% of the A-component epoxy resin, 0.5% of the aramid 1313 mesh fiber, and 7.5% of the silica, the A-component aramid epoxy resin adhesive is obtained.

The mixing time is 30 min.

b) Purchase B-component epoxy resin (curing agent).

The performance of the sample block prepared in Example 4 of the present invention was tested.

See Table 4, which is the performance data of the aramid epoxy resin molding adhesive prepared in Example 4 of the present invention.

Table 4 Test data of samples of aramid epoxy resin molding glue (Hanikang CP2017)

完全固化胶体硬度Hardness of fully cured colloid	邵氏：≥90DShaw: ≥90D
固化胶块压缩强度Compressive strength of cured rubber block	≥60MPa≥60MPa
完全固化胶体密度Density of fully cured colloid	≦1.6克/cm ³ ≦1.6g/cm ³
剪切强度(MPa)Shear strength (MPa)	≥13MPa(60℃保温3天，25℃常温7天)≥13MPa (3 days at 60℃, 7 days at 25℃ normal temperature)

Example 5

Preparation of prepreg cured sheet:

Wipe and clean the mold with solvent and check the flatness of the mold. Coat the contact surface between the prepreg and the mold with 55NC release agent, lay two or more layers of glass fiber phenolic prepreg in the mold evenly, and place the mold in the hot press. Raise the temperature from 20°C to 80°C and keep the temperature for 40 minutes, the heating rate is 1°C/min, the pressure is 0.1MPa; then the temperature is raised to 120°C and the temperature is kept for 60 minutes, the heating rate is 2°C/min, and the pressure is 0.2MPa; The temperature rise rate is 2°C/min and the pressure is 0.3 MPa to 150°C and heat preservation for 20 min. After cooling, it is taken out of the mold to prepare a qualified glass fiber phenolic prepreg cured sheet.

The performance of the glass fiber phenolic prepreg cured sheet prepared in Example 5 of the present invention was tested.

See Table 5. Table 5 is the performance data of the glass fiber phenolic prepreg cured sheet prepared in Example 5 of the present invention.

table 5

Preparation of aramid honeycomb composite parts:

The glued surfaces of the two prepreg cured sheets are smoothed with sandpaper, then dusted and wiped with acetone solvent. Coat the Hanikon adhesive CP2016 uniformly according to the glue amount of 330 g/m2, and glue it on the upper and lower sides of the aramid honeycomb to form a sandwich structure. Put it into the press and press 0.2MPa at room temperature around 25℃. After 24 hours, it will reach the initial solidification (can be transferred to the subsequent process for further processing), or put it into the press and press 0.2MPa at a constant temperature of 60℃. Achieve initial curing after hours (can be transferred to the next process for reprocessing).

Cut the edge of the honeycomb prepreg composite part (board) according to the size of the drawing with a disc push saw or a five-axis machining center, and then use the Hanikon edge banding glue CP2015 edge banding glue to process the edge, and wait for the solidification before loading on the five-axis machining center Accurately cut the edges and open the holes, and fill the screw sleeves or hardware with Hanikon adhesive CP2016. Hanikang does not need to be pressurized for curing, and the curing time temperature: the initial curing can be achieved after 24 hours at room temperature about 25°C or 3 hours at constant temperature of 60°C.

The performance of the aramid honeycomb composite part prepared in Example 5 of the present invention was tested.

See Table 6, which is the performance data of the roller peel test of the aramid honeycomb composite part prepared in Example 5 of the present invention.

Table 6

PS: The test standard stipulates that 5 samples are tested simultaneously to obtain the average value.

See Table 7, which is the performance data of the aramid honeycomb composite part prepared in Example 5 of the present invention.

Table 7

Example 6

Preparation of fast-curing prepreg cured sheet:

Wipe and clean the mold with solvent and check the flatness of the mold. Coat the contact surface between the prepreg and the mold with 55NC release agent, lay two or more layers of glass fiber phenolic prepreg in the mold evenly, and place the mold in the hot press. The temperature was raised from 60°C to 145°C and kept for 30 minutes, the heating rate was 3°C/min, and the pressure was 0.25MPa. After cooling to 60°C, it was taken out of the mold to prepare qualified fast curing glass fiber phenolic prepregs sheet.

The performance of the glass fiber phenolic prepreg cured sheet prepared in Example 6 of the present invention was tested.

See Table 8. Table 8 is the performance data of the glass fiber phenolic prepreg cured sheet prepared in Example 6 of the present invention.

Table 8

Preparation of aramid honeycomb composite parts:

The performance of the aramid honeycomb composite part prepared in Example 6 of the present invention was tested.

See Table 9. Table 9 is the roll peel test performance data of the aramid honeycomb composite prepared in Example 6 of the present invention.

Table 9

See Table 10, which is the performance data of the aramid honeycomb composite part prepared in Example 6 of the present invention.

Table 10

Example 7

Preparation of prepreg cured sheet:

Wipe and clean the mold with solvent and check the flatness of the mold. Coat the contact surface between the prepreg and the mold with 55NC release agent, lay two or more layers of glass fiber phenol aldehyde prepreg in the mold evenly, close the mold and put it into the hot press. Raise the temperature from 20°C to 80°C and keep the temperature for 40 minutes, the heating rate is 1°C/min, the pressure is 0.1MPa; then the temperature is raised to 120°C and the temperature is kept for 60 minutes, the heating rate is 2°C/min, and the pressure is 0.2MPa; The temperature rise rate is 2°C/min and the pressure is 0.3 MPa to 150°C and heat preservation for 20 min. After cooling, it is taken out of the mold to prepare a qualified glass fiber phenolic prepreg cured sheet.

The performance of the glass fiber phenolic prepreg cured sheet prepared in Example 7 of the present invention was tested.

See Table 11. Table 11 is the performance data of the glass fiber phenolic prepreg cured sheet prepared in Example 7 of the present invention.

Table 11

Preparation of heating and curing aramid honeycomb composite parts:

The glued surfaces of the two prepreg cured sheets are smoothed with sandpaper, then dusted and wiped with acetone solvent. Coat the Hanikon adhesive CP2016 uniformly according to the glue amount of 330 g/m2, and glue it on the upper and lower sides of the aramid honeycomb to form a sandwich structure. Put it into the press and press 0.2MPa at a constant temperature of 60°C. After 3 hours, it will be initially solidified (it can be transferred to the next process for further processing).

Cut the edge of the honeycomb prepreg composite part (board) according to the size of the drawing with a disc push saw or a five-axis machining center, and then use the Hanikon edge banding glue CP2015 edge banding glue to process the edge, and wait for the solidification before loading on the five-axis machining center Accurately cut the edges and open the holes, and fill the screw sleeves or hardware with Hanikon adhesive CP2016. Hanikang does not need to be pressurized for curing, and the curing time temperature: the initial curing can be achieved after 24 hours at room temperature of about 25℃ or 3 hours at constant temperature of 60℃.

The performance of the aramid honeycomb composite part prepared in Example 7 of the present invention was tested.

See Table 12, which is the roll peel test performance data of the aramid honeycomb composite prepared in Example 7 of the present invention.

Table 12

See Table 13, which is the performance data of the aramid honeycomb composite part prepared in Example 7 of the present invention.

Table 13

The above is a detailed introduction to the aramid paper honeycomb provided by the present invention and its normal temperature preparation method and application. Specific examples are used in this article to illustrate the principles and implementation of the present invention. The description of the above examples is only for It helps to understand the method and core idea of the present invention, including the best mode, and also enables any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims, and may include other embodiments that those skilled in the art can think of. If these other embodiments have structural elements that are not different from the literal expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, these other embodiments shall also be included in the scope of the claims.

Claims

An aramid paper honeycomb composite article, characterized in that it comprises a prepreg cured sheet, an aramid paper honeycomb core and Hanikon glue;

The aramid paper honeycomb core is compounded between the cured prepreg sheets to form a sandwich structure;

The Hanacon glue includes Hanacon adhesive glue;

The Hanikon adhesive is bonded between the aramid paper honeycomb core and the prepreg cured sheet.
The aramid paper honeycomb composite article according to claim 1, wherein the Hanikon glue further comprises Hanikon edge banding glue;

The Hanikang edge banding glue is used as the edge banding of the aramid paper honeycomb composite part;

The prepreg cured sheet includes glass fiber and/or carbon fiber prepreg cured sheet;

The Hanikang glue can also be filled and embedded in any position of the aramid paper honeycomb composite part;

The aramid paper honeycomb composite article also includes hardware.
The aramid paper honeycomb composite article according to claim 2, wherein the arbitrary position includes a position that requires later machining or manual processing;

The processing method includes one or more of size positioning, edge trimming, hole opening and grooving;

The hardware is set at the place where the Hanikang glue is filled with pre-buried or post-buried;

The hardware can also be used in conjunction with the Hanikang glue when installed.
The aramid paper honeycomb composite article according to claim 1, wherein the prepreg cured sheet comprises a double-layer prepreg cured sheet and/or a multilayer prepreg cured sheet;

The thickness of the double-layer prepreg cured sheet is 0.3 to 0.36 mm;

The thickness of the multilayer cured prepreg sheet is greater than or equal to 0.45 mm;

The resin content of the cured prepreg sheet is 35%-65%;

The volatile content of the cured prepreg sheet is less than or equal to 8%;

The aramid paper honeycomb composite article is an aramid paper honeycomb composite article that can be cured at room temperature.
The aramid paper honeycomb composite article according to any one of claims 1 to 4, characterized in that the Hanikang glue, calculated as a percentage by mass of the raw material, comprises:

The aramid 1313 mesh fiber is a flocculent fiber cluster aramid 1313 fiber, and the aramid 1313 fiber filaments are interwoven to form a three-dimensional network structure;

The shape of the aramid paper honeycomb core includes one or more of a regular hexagonal honeycomb core, a polygonal honeycomb core, a corrugated honeycomb core, and an overstretched honeycomb core;

The cell size of the aramid paper honeycomb core is 1.83～3.67mm;

The density of the aramid paper honeycomb core is 32～120kg/m 3 ;

The height of the aramid paper honeycomb core is 1 to 860 mm.
A preparation method of aramid paper honeycomb composite article, characterized in that it comprises the following steps:

1) The aramid paper honeycomb is used as the core material, and the cured prepreg sheet is used as the surface material. The adhesive is bonded by Hanikon adhesive. After the mold is clamped and pressurized and cured, the edge is sealed with Hanikon edge sealing adhesive to obtain Aramid paper honeycomb composite parts.
The preparation method according to claim 6, wherein the temperature of the clamping and pressure curing is 25-60°C;

The initial curing time of the clamping and pressure curing is 3 to 48 hours;

The complete curing time of the clamping and pressure curing is 1-7 days;

The pressure of the clamping and pressure curing is 0.1-0.3 MPa;

The prepreg cured sheet is obtained by curing glass fiber and/or carbon fiber prepreg through heat and pressure;

The heat and pressure curing temperature is 120-150°C;

The heat and pressure curing time is 25 to 330 minutes;

The heat and pressure curing pressure is 0.1-0.3 MPa.
The preparation method according to claim 6, wherein the pre-treatment step is further included before the bonding;

The pretreatment includes one or more of cutting, sanding, degreasing and dust removal;

The dosage of the Hanacon adhesive is 300-350 g/m2;

After the bonding, it also includes a filling and embedding step;

Before and/or after the edge sealing, it also includes a machining step;

Before obtaining the aramid paper honeycomb composite article, a post-processing step is also included.
The preparation method according to claim 8, wherein the filling and embedding step is specifically:

In the position that needs later machining or manual processing, fill with Hanikon adhesive glue for pre-embedding;

The machining steps are specifically:

After one or more steps of size positioning, edge trimming, opening and grooving are carried out on the filling and embedded position of the part, add hardware or add hardware with the use of Hanecon adhesive;

The post-treatment step includes one or more of spray painting, film sticking and fireproof board sticking.
The aramid paper honeycomb composite article according to any one of claims 1 to 5 or the aramid paper honeycomb composite article prepared by the preparation method according to any one of claims 6 to 9 is used in rail transit for light weight and light weight Application of flame retardant board furniture.