CN112590339B - Sandwich structure sandwich plate based on glass fiber reinforced plastic reclaimed materials and preparation method thereof - Google Patents

Sandwich structure sandwich plate based on glass fiber reinforced plastic reclaimed materials and preparation method thereof Download PDF

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CN112590339B
CN112590339B CN202011289817.7A CN202011289817A CN112590339B CN 112590339 B CN112590339 B CN 112590339B CN 202011289817 A CN202011289817 A CN 202011289817A CN 112590339 B CN112590339 B CN 112590339B
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fiber reinforced
glass fiber
parts
mass
reinforced plastic
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CN112590339A (en
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刘晓玲
成帅
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University of Nottingham Ningbo China
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University of Nottingham Ningbo China
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/26—Layered products comprising a layer of synthetic resin characterised by the use of special additives using curing agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/045—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/728—Hydrophilic

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a sandwich plate based on recycled glass fiber reinforced plastic materials and a preparation method thereof, wherein the sandwich plate comprises a core material and surface layer panels positioned on the surfaces of two sides of the core material, the surface layer panels are fixedly bonded with the core material through a plurality of reinforced fiber material layers, the core material comprises 75-85 parts by mass of first resin, 12-15 parts by mass of hollow glass microspheres, 1-9 parts by mass of broken glass fiber reinforced plastic materials and 1-3 parts by mass of first curing agents, the broken glass fiber reinforced plastic materials are cut and sieved to form broken glass fiber reinforced plastic materials, and the surface layer panels comprise 97-99 parts by mass of second resin and 1-3 parts by mass of second curing agents. The foam core material prepared by the invention has the advantages of high mechanical property, low water absorption, easy molding, low equipment cost, low energy consumption and high stability, thereby changing waste glass fiber reinforced plastic into valuable, and being more energy-saving and environment-friendly.

Description

Sandwich structure sandwich plate based on glass fiber reinforced plastic reclaimed materials and preparation method thereof
Technical Field
The invention relates to the technical field of composite materials, in particular to a sandwich structure sandwich plate based on glass fiber reinforced plastic reclaimed materials and a preparation method thereof.
Background
Recently, glass fiber reinforced plastics are rapidly developed in China, the application field is wide, and the rejected glass fiber reinforced plastics waste and the scrap in the production process are increased rapidly along with the continuous development of the polymer-based glass fiber composite material industry. The problems of solid waste and derived pollution of the glass fiber reinforced plastics to be treated become bottlenecks which restrict the continuous development of the glass fiber reinforced plastics industry.
The recovery mode of the thermosetting glass fiber reinforced plastics mainly adopts mechanical recovery with low energy consumption, but the economic value of the recovered materials is low. The traditional treatment mode is mainly combustion pyrolysis of an incinerator or landfill, but environmental problems are derived and resources are wasted. The composite material prepared by mechanical crushing and sieving as a filler or a reinforcing material is a relatively green and feasible recycling way.
The recycled glass fiber reinforced plastic powder is usually used for building materials and road engineering, and the application field can be greatly expanded in view of the fact that a sandwich structure has typical characteristics of light weight, high rigidity and high strength and sound and heat insulation effects. Most sandwich structure composite material cores are open cell foams formed by conventional chemical foaming. In view of the difficulty in controlling the defects of the open-cell structure formed by chemical foaming, the traditional open-cell foam material has the defects of poor mechanical property, easiness in water absorption and the like, so that the application field of the traditional chemical foam composite material is limited.
Therefore, in order to solve the above technical problems, it is necessary to provide a sandwich structure sandwich plate based on recycled glass fiber reinforced plastics and a method for preparing the same.
Disclosure of Invention
In view of the above, the present invention provides a sandwich structure sandwich plate based on recycled glass fiber reinforced plastic materials and a preparation method thereof, which can be widely used in the field of sound insulation and heat insulation materials.
In order to achieve the above object, an embodiment of the present invention provides the following technical solutions:
the sandwich structure sandwich plate based on the recycled glass fiber reinforced plastic materials comprises core materials and surface layer panels, wherein the surface layer panels are located on the surfaces of two sides of the core materials, the surface layer panels are fixedly bonded with the core materials through a plurality of reinforced fiber material layers, the core materials comprise 75-85 parts by mass of first resin, 12-15 parts by mass of hollow glass microspheres, 1-9 parts by mass of broken glass fiber reinforced plastic materials and 1-3 parts by mass of first curing agents, the broken glass fiber reinforced plastic materials are broken materials which are prepared by cutting and sieving recycled glass fiber reinforced plastic materials, and the surface layer panels comprise 97-99 parts by mass of second resin and 1-3 parts by mass of second curing agents.
As a further improvement of the present invention, the first resin and the second resin are the same material.
As a further improvement of the invention, the first resin is unsaturated polyester, the first curing agent is methyl ethyl ketone peroxide, and the particle size of the glass fiber reinforced plastic broken material is less than or equal to 6.0mm.
As a further improvement of the invention, the second resin is unsaturated polyester, the second curing agent is methyl ethyl ketone peroxide, and the surface panel contains a cobalt salt pre-accelerator.
As a further improvement of the present invention, the reinforcing fiber material layer is at least one of glass fiber cloth, carbon fiber cloth or plant fiber cloth, and the structure type of the glass fiber cloth is at least one of 0 °/90 ° axial cloth, ± 45 ° axial cloth, chopped strand mat, 0 °/90 ° axial and chopped strand mat composite cloth, and 0 °/90 ° axial and chopped strand mat composite cloth.
The technical scheme provided by another embodiment of the invention is as follows:
a preparation method of a sandwich structure sandwich plate based on glass fiber reinforced plastic reclaimed materials comprises the following steps:
s1, mixing 75-85 parts by mass of first resin, 12-15 parts by mass of hollow glass microspheres, 1-9 parts by mass of glass fiber reinforced plastic broken materials and 1-3 parts by mass of first curing agents to prepare a core material;
s2, paving fiber reinforced material layers on the surfaces of the two sides of the core material;
and S3, mixing 97-99 parts by mass of second resin and 1-3 parts by mass of second curing agent, and forming surface layer panels on the two side surfaces of the core material by a vacuum introduction method.
As a further improvement of the present invention, the step S1 specifically includes:
cutting and sieving the recycled glass fiber reinforced plastic material to prepare a broken glass fiber reinforced plastic material;
adding 1-9 parts by mass of glass fiber reinforced plastic broken materials into 75-85 parts by mass of first resin, and stirring to enable the glass fiber reinforced plastic broken materials to be soaked and dispersed by the resin;
adding 12-15 parts by mass of hollow glass microspheres by a one-half feeding method, and uniformly stirring and dispersing;
adding 1-3 parts by weight of a first curing agent, and uniformly stirring for reaction;
and pouring and curing at normal temperature to obtain the core material.
As a further improvement of the present invention, the step S1 further includes:
the hollow glass microsphere and/or glass fiber reinforced plastic crushed material is pretreated by a coupling agent.
As a further improvement of the present invention, the step S2 specifically includes:
the surface of the mould is coated with a release agent, and a lower flow guide net, a lower demoulding cloth, a lower fiber reinforced material layer, a core material, an upper fiber reinforced material layer, an upper demoulding cloth and an upper flow guide net are sequentially paved on the mould.
As a further improvement of the present invention, the step S3 specifically includes:
and forming a sealed space on the two side surfaces of the core material in the mould through a vacuum bag, arranging a resin inlet pipeline and an exhaust pipeline on the vacuum bag, connecting the resin inlet pipeline and the resin inlet pipeline together, vacuumizing through a vacuum system, introducing 97-99 parts by mass of second resin and 1-3 parts by mass of second curing agent into a resin barrel for infusion, and curing at normal temperature.
The invention has the beneficial effects that:
the invention recycles the recycled glass fiber reinforced plastic material to prepare the bulk molding compound, can fully utilize the glass fiber reinforced plastic waste material, and reduces the environmental pollution;
the invention solves the problem of recycling the glass fiber reinforced plastic, has scientific and reasonable process and low cost, and is suitable for popularization and application in the glass fiber reinforced plastic industry;
the foam core material prepared by the invention has the advantages of high mechanical property, low water absorption, easy molding, low equipment cost, low energy consumption and high stability, so that the waste glass fiber reinforced plastic is changed into valuable, and the foam core material is more energy-saving and environment-friendly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a process flow diagram of the method of making a sandwich plate of a sandwich structure of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
The invention discloses a sandwich plate with a sandwich structure based on recycled glass fiber reinforced plastic materials, which comprises a core material and surface layer panels positioned on the surfaces of two sides of the core material, wherein the surface layer panels and the core material are fixedly bonded through a plurality of reinforced fiber material layers, the core material comprises 75-85 parts by mass of first resin, 12-15 parts by mass of hollow glass microspheres, 1-9 parts by mass of broken glass fiber reinforced plastic materials and 1-3 parts by mass of first curing agents, the broken glass fiber reinforced plastic materials are cut and sieved to form broken glass fiber reinforced plastic materials, and the surface layer panels comprise 97-99 parts by mass of second resin and 1-3 parts by mass of second curing agents.
Preferably, the material of the first resin and the second resin is the same.
Further, the first resin is unsaturated polyester (UP resin), the first curing agent is Methyl Ethyl Ketone Peroxide (MEKP), and the particle size of the glass fiber reinforced plastic broken materials is less than or equal to 6.0mm.
Furthermore, the second resin is unsaturated polyester (UP resin), the second curing agent is Methyl Ethyl Ketone Peroxide (MEKP), and the surface panel contains a cobalt salt pre-accelerator.
Further, the reinforcing fiber material layer is at least one of glass fiber cloth, carbon fiber cloth or plant fiber cloth, and the structure type of the glass fiber cloth is at least one of 0 °/90 ° axial cloth, ± 45 ° axial cloth, chopped strand mat, 0 °/90 ° axial and chopped strand mat composite cloth, and 0 °/90 ° axial and chopped strand mat composite cloth.
Referring to fig. 1, the invention also discloses a preparation method of the sandwich structure sandwich plate based on the recycled glass fiber reinforced plastic material, which comprises the following steps:
s1, mixing 75-85 parts by mass of first resin, 12-15 parts by mass of hollow glass microspheres, 1-9 parts by mass of glass fiber reinforced plastic crushed material and 1-3 parts by mass of first curing agent to prepare a core material;
s2, paving fiber reinforced material layers on the surfaces of the two sides of the core material;
and S3, mixing 97-99 parts by mass of second resin and 1-3 parts by mass of second curing agent, and forming surface layer panels on the two side surfaces of the core material by a vacuum introduction method.
Preferably, step S1 is specifically:
cutting and sieving the recycled glass fiber reinforced plastic material to prepare a broken glass fiber reinforced plastic material;
adding 1-9 parts by mass of glass fiber reinforced plastic broken materials into 75-85 parts by mass of first resin, and stirring to enable the glass fiber reinforced plastic broken materials to be soaked and dispersed by the resin;
adding 12-15 parts by mass of hollow glass microspheres by a one-half feeding method, and uniformly stirring and dispersing;
adding 1-3 parts by weight of a first curing agent, and uniformly stirring for reaction;
and pouring and curing at normal temperature to obtain the core material.
Further, step S1 further includes:
the hollow glass microsphere and/or glass fiber reinforced plastic crushed material is pretreated by a coupling agent.
Preferably, step S2 is specifically:
the surface of the mould is coated with a release agent, and a lower flow guide net, a lower demoulding cloth, a lower fiber reinforced material layer, a core material, an upper fiber reinforced material layer, an upper demoulding cloth and an upper flow guide net are sequentially paved on the mould.
Preferably, step S3 is specifically:
and forming a sealed space on the two side surfaces of the core material in the mould through a vacuum bag, arranging a resin inlet pipeline and an exhaust pipeline on the vacuum bag, connecting the resin inlet pipeline and the resin inlet pipeline together, vacuumizing through a vacuum system, introducing 97-99 parts by mass of second resin and 1-3 parts by mass of second curing agent into a resin barrel for infusion, and curing at normal temperature.
In contrast to conventional open-cell foams, synthetic foams are composed of a number of air pores enclosed within hollow microspheres or particles. By selecting proper hollow microspheres, the comprehensive properties of the synthetic foam, such as mechanical property, thermal resistance, water absorption and the like, can be well regulated and controlled. Meanwhile, the microsphere foam composite material has the advantages of easiness in forming, low equipment cost, high production efficiency and low energy consumption, and is suitable for matching with a glass fiber reinforced plastic reclaimed material with lower economic value.
The recycled glass fiber reinforced plastic material is used for reinforcing the sandwich core filled with the hollow glass microspheres, so that the formed closed pore structure is not damaged, and the mechanical strength of the recycled glass fiber reinforced plastic material can be effectively improved by the fibers in the recycled material. By regulating and controlling the filling proportion and the pretreatment of the coupling agent, the mechanical property of the sandwich plate is improved under the condition of not increasing the density as much as possible.
At present, in the aspect of recycling of recycled glass fiber reinforced plastics, the research of filling and preparing the sandwich foam sandwich plate is not seen, and the recycled materials are only simply filled to prepare the composite material. In the aspect of synthetic foam materials, most of the research is directed to the manufacturing method and mechanical properties thereof. The literature of using recycled glass fiber reinforced plastics for reinforcing foam sandwich filled with hollow glass beads and manufacturing sandwich plates with sandwich structures is rarely reported.
The present invention is further illustrated by the following specific examples.
Example 1:
the sandwich structure sandwich plate in the embodiment comprises a core material and surface layer panels positioned on the surfaces of two sides of the core material, wherein the surface layer panels are fixedly bonded with the core material through a plurality of reinforced fiber material layers.
Wherein, the core material comprises the following components in parts by weight:
81.13 parts of a first resin, in particular an unsaturated polyester (UP resin);
14.37 parts of hollow glass microspheres;
2.87 parts of glass fiber reinforced plastic crushed materials, wherein the glass fiber reinforced plastic crushed materials are crushed materials prepared by cutting and sieving glass fiber reinforced plastic reclaimed materials, and the particle size of the crushed materials is less than or equal to 6.0mm;
1.63 parts of a first curing agent, specifically Methyl Ethyl Ketone Peroxide (MEKP).
The reinforcing fiber material layer is made of chopped strand mats, specifically chopped alkali-free glass fiber mats, and 4 layers of reinforcing fiber material layers are arranged on each side surface of the core material.
Wherein, the surface layer panel comprises the following components in parts by weight:
98 parts of a second resin, in particular an unsaturated polyester (UP resin);
and 2 parts of a second curing agent, specifically Methyl Ethyl Ketone Peroxide (MEKP).
The preparation method of the sandwich plate with the sandwich structure comprises the following steps:
1. preparation of a foamed Sandwich
Cutting and sieving the recycled glass fiber reinforced plastic material to prepare a broken glass fiber reinforced plastic material, and sieving the broken glass fiber reinforced plastic material to obtain a powder with a particle size of less than or equal to 6.0mm;
pretreating hollow glass microspheres and glass fiber reinforced plastic broken materials by using a coupling agent;
adding 2.87 parts by mass of glass fiber reinforced plastic broken materials into 81.13 parts by mass of unsaturated polyester, and stirring for 10 minutes to enable the glass fiber reinforced plastic broken materials to be soaked and dispersed by resin;
adding 14.37 parts by weight of hollow glass microspheres by a one-half feeding method, and stirring for 10 minutes to uniformly disperse the hollow glass microspheres;
adding 1.63 parts by mass of methyl ethyl ketone peroxide, and stirring for 5 minutes to enable the methyl ethyl ketone peroxide to react uniformly;
pouring into a mold with the thickness of 200mm × 10mm, and curing at normal temperature for 12 hours to obtain the core material.
And finally, properly polishing the core material by using 120-mesh sand paper to remove corners and raised areas, and immediately wiping the core material by using acetone, wherein the thickness of the core material is 5-10mm.
2. Laying up layers of fibrous reinforcement
Cleaning the surface of the mold, coating a release agent, and then attaching a sealing adhesive tape around the mold;
and a lower flow guide net, a lower demolding cloth, a lower fiber reinforced material layer, a core material, an upper fiber reinforced material layer, an upper demolding cloth and an upper flow guide net are sequentially paved on the mold, wherein the lower fiber reinforced material layer and the upper fiber reinforced material layer are both short alkali-free glass fiber felts.
3. Preparation of skin Panel
Forming a sealed space on the two side surfaces of a core material in the mould through a vacuum bag, arranging a resin introducing pipeline and an air exhaust pipeline on the vacuum bag, connecting a glue injection pipe and the resin introducing pipeline together, connecting the air exhaust pipe and the air exhaust pipeline, connecting the air exhaust pipe with a vacuum system, sealing the vacuum bag through a sealing adhesive tape, vacuumizing through the vacuum system, and introducing 98 parts by mass of unsaturated polyester and 2 parts by mass of methyl ethyl ketone peroxide into a resin barrel for infusion. And after the resin is completely soaked in the fibers, screwing the flow stopping clamp, sealing the glue injection pipeline and taking the glue injection pipeline out of the resin barrel. In the process of vacuumizing, the corners are finished to form good gas channels to prevent the fabric from bridging.
And after the unsaturated resin is cured for 24 hours at normal temperature, taking the product out of the mold, and carrying out post-curing treatment at the temperature of 80 ℃ for 3 hours.
Example 2:
the sandwich structure sandwich plate in the embodiment comprises a core material and surface layer panels positioned on the surfaces of two sides of the core material, wherein the surface layer panels are fixedly bonded with the core material through a plurality of reinforced fiber material layers.
Wherein, the core material comprises the following components in parts by weight:
76.72 parts of a first resin, in particular an unsaturated polyester (UP resin);
13.59 parts of hollow glass microspheres;
8.16 parts of glass fiber reinforced plastic crushed material, wherein the glass fiber reinforced plastic crushed material is prepared by cutting and sieving recycled glass fiber reinforced plastic materials, and the particle size of the crushed material is less than or equal to 6.0mm;
1.53 parts of a first curing agent, specifically Methyl Ethyl Ketone Peroxide (MEKP).
The reinforcing fiber material layer is made of chopped strand mats, specifically chopped alkali-free glass fiber mats, and 4 layers of reinforcing fiber material layers are arranged on each side surface of the core material.
Wherein, the surface layer panel comprises the following components in parts by weight:
98 parts of a second resin, in particular an unsaturated polyester (UP resin);
and 2 parts of a second curing agent, specifically Methyl Ethyl Ketone Peroxide (MEKP).
The preparation method of the sandwich plate with the sandwich structure comprises the following steps:
1. preparation of the foam core
Cutting and sieving the recycled glass fiber reinforced plastic material to prepare a broken glass fiber reinforced plastic material, and sieving the broken glass fiber reinforced plastic material to obtain a powder with a particle size of less than or equal to 6.0mm;
pretreating hollow glass microspheres and glass fiber reinforced plastic crushed materials by using a coupling agent;
adding 8.16 parts by mass of glass fiber reinforced plastic broken materials into 76.72 parts by mass of unsaturated polyester, and stirring for 10 minutes to enable the glass fiber reinforced plastic broken materials to be soaked and dispersed by resin;
adding 13.59 parts by weight of hollow glass microspheres by a one-half feeding method, and stirring for 10 minutes to uniformly disperse the hollow glass microspheres;
adding 1.53 parts by mass of methyl ethyl ketone peroxide, and stirring for 5 minutes to enable the methyl ethyl ketone peroxide to react uniformly;
pouring into a mold with the thickness of 200mm × 10mm, and curing at normal temperature for 12 hours to obtain the core material.
And finally, properly polishing the core material by using 120-mesh sand paper to remove corners and raised areas, and immediately wiping the core material by using acetone, wherein the thickness of the core material is 5-10mm.
2. Laying up layers of fibrous reinforcement
Cleaning the surface of the mold, coating a release agent, and then attaching a sealing adhesive tape around the mold;
and sequentially paving a lower flow guide net, a lower demolding cloth, a lower fiber reinforced material layer, a core material, an upper fiber reinforced material layer, an upper demolding cloth and an upper flow guide net on the mold, wherein the lower fiber reinforced material layer and the upper fiber reinforced material layer are both short alkali-free glass fiber felts.
3. Preparation of skin Panel
Forming a sealed space on the two side surfaces of a core material in the mould through a vacuum bag, arranging a resin introducing pipeline and an air exhaust pipeline on the vacuum bag, connecting a glue injection pipe and the resin introducing pipeline together, connecting the air exhaust pipe and the air exhaust pipeline, connecting the air exhaust pipe with a vacuum system, sealing the vacuum bag through a sealing adhesive tape, vacuumizing through the vacuum system, and introducing 98 parts by mass of unsaturated polyester and 2 parts by mass of methyl ethyl ketone peroxide into a resin barrel for infusion. And after the resin is completely soaked in the fibers, screwing the flow stopping clamp, sealing the glue injection pipeline and taking the glue injection pipeline out of the resin barrel. In the process of vacuumizing, the corners are finished to form good gas channels to prevent the fabric from bridging.
And after the unsaturated resin is cured for 24 hours at normal temperature, taking the product out of the mold, and carrying out post-curing treatment at the temperature of 80 ℃ for 3 hours.
The sandwich plates of the sandwich structures of examples 1 and 2 were tested for mechanical properties, the results of which are given in the following table:
table 1: sandwich plate mechanical property test meter with sandwich structure
Example 1 Example 2
Compressive strength (MPa) 85.47 86.61
Flexural Strength (MPa) 196.39 176.01
The sandwich plate with the sandwich structure has the following advantages:
1. the density of the core material doped with the hollow glass microspheres in the sandwich plate with the sandwich structure is between 1.13 and 1.14g/ml, the weight is light, and the water absorption rate is low compared with that of a honeycomb structure;
2. reasonably adding glass fiber reinforced plastic broken materials as reinforcing materials into the core materials, successfully digesting part of density increase caused by doping of composite material reclaimed materials with low added value under the condition of ensuring stable compression strength;
3. the surface layer panel and the core material structure adopt the same resin, which is beneficial to the bonding of the resin carried in the recycled glass fiber reinforced plastic material and the resin matrix of the core material and the adhesion of the surface layer panel and the core material;
4. the vacuum introduction method reduces bubbles between the resin and the reinforced fiber material layer of the surface layer panel, and improves the glass fiber content in the surface layer panel, which can reach more than 70%.
According to the technical scheme, the invention has the following beneficial effects:
the invention recycles the recycled glass fiber reinforced plastic material to prepare the bulk molding compound, can fully utilize the glass fiber reinforced plastic waste material, and reduces the environmental pollution;
the invention solves the problem of recycling the glass fiber reinforced plastic, has scientific and reasonable process and low cost, and is suitable for popularization and application in the glass fiber reinforced plastic industry;
the foam core material prepared by the invention has the advantages of high mechanical property, low water absorption, easy molding, low equipment cost, low energy consumption and high stability, thereby changing waste glass fiber reinforced plastic into valuable, and being more energy-saving and environment-friendly.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.

Claims (10)

1. The sandwich structure sandwich plate based on the glass fiber reinforced plastic reclaimed materials is characterized by comprising core materials and surface layer panels, wherein the surface layer panels are positioned on the surfaces of two sides of the core materials, the surface layer panels are fixedly bonded with the core materials through a plurality of reinforced fiber material layers, the core materials comprise 75-85 parts by mass of first resin, 12-15 parts by mass of hollow glass microspheres, 1-9 parts by mass of broken glass fiber reinforced plastic materials and 1-3 parts by mass of first curing agents, the broken glass fiber reinforced plastic materials are crushed materials prepared by cutting and sieving glass fiber reinforced plastic reclaimed materials, the surface layer panels comprise 97-99 parts by mass of second resin and 1-3 parts by mass of second curing agents, and the particle size of the broken glass fiber reinforced plastic materials is smaller than or equal to 6.0mm.
2. The sandwich panel of claim 1, wherein the first and second resins are the same material.
3. The sandwich panel based on glass fiber reinforced plastic recycled materials of claim 1, wherein the first resin is unsaturated polyester and the first curing agent is methyl ethyl ketone peroxide.
4. The sandwich panel based on recycled glass fiber reinforced plastic as claimed in claim 1, wherein the second resin is unsaturated polyester, the second curing agent is methyl ethyl ketone peroxide, and the top panel comprises cobalt salt pre-accelerator.
5. The sandwich panel with a sandwich structure based on recycled glass fiber reinforced plastics as claimed in claim 1, wherein the reinforcing fiber material layer is at least one of glass fiber cloth, carbon fiber cloth or plant fiber cloth, and the structure type of the glass fiber cloth is at least one of 0 °/90 ° axial cloth, ± 45 ° axial cloth, chopped strand mat, and 0 °/90 ° axial and chopped strand mat composite cloth.
6. A preparation method of a sandwich structure sandwich plate based on glass fiber reinforced plastic reclaimed materials is characterized by comprising the following steps:
s1, mixing 75-85 parts by mass of first resin, 12-15 parts by mass of hollow glass microspheres, 1-9 parts by mass of glass fiber reinforced plastic broken materials and 1-3 parts by mass of first curing agents to prepare a core material, wherein the particle size of the glass fiber reinforced plastic broken materials is less than or equal to 6.0mm;
s2, paving fiber reinforced material layers on the surfaces of the two sides of the core material;
and S3, mixing 97-99 parts by mass of second resin and 1-3 parts by mass of second curing agent, and forming surface layer panels on the two side surfaces of the core material by a vacuum introduction method.
7. The method for preparing a sandwich plate based on recycled glass fiber reinforced plastics according to claim 6, wherein the step S1 comprises:
cutting and sieving the recycled glass fiber reinforced plastic material to prepare a broken glass fiber reinforced plastic material;
adding 1-9 parts by mass of glass fiber reinforced plastic broken materials into 75-85 parts by mass of first resin, and stirring to enable the glass fiber reinforced plastic broken materials to be soaked and dispersed by the resin;
adding 12-15 parts by mass of hollow glass microspheres by a one-half feeding method, and uniformly stirring and dispersing;
adding 1-3 parts by weight of a first curing agent, and uniformly stirring for reaction;
and pouring and curing at normal temperature to obtain the core material.
8. The method for preparing sandwich plate based on recycled glass fiber reinforced plastics of claim 7, wherein the step S1 further comprises:
the hollow glass microsphere and/or glass fiber reinforced plastic crushed material is pretreated by a coupling agent.
9. The method for preparing a sandwich plate based on recycled glass fiber reinforced plastics according to claim 6, wherein the step S2 comprises:
the surface of the mould is coated with a release agent, and a lower flow guide net, a lower demoulding cloth, a lower fiber reinforced material layer, a core material, an upper fiber reinforced material layer, an upper demoulding cloth and an upper flow guide net are sequentially paved on the mould.
10. The method for preparing a sandwich plate based on recycled glass fiber reinforced plastics according to claim 9, wherein the step S3 is specifically as follows:
and forming a sealed space on the two side surfaces of the core material in the mould through a vacuum bag, arranging a resin inlet pipeline and an exhaust pipeline on the vacuum bag, connecting the resin inlet pipeline and the resin inlet pipeline together, vacuumizing through a vacuum system, introducing 97-99 parts by mass of second resin and 1-3 parts by mass of second curing agent into a resin barrel for infusion, and curing at normal temperature.
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