CN209999805U

CN209999805U - kinds of foam sandwich light composite board

Info

Publication number: CN209999805U
Application number: CN201822238184.1U
Authority: CN
Inventors: 唐超; 陈华刚; 曾瑞东; 洪机剑; 陈文泉; 骆钰栋; 刘兵
Original assignee: New Materials Co Ltd Zhejiang China Is
Current assignee: New Materials Co Ltd Zhejiang China Is
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2020-01-31
Anticipated expiration: 2028-12-28

Abstract

The utility model relates to an foam with filling light composite sheet, its characterized in that includes the light core board of middle part fretwork, light core board middle part fretwork department inlays the light core material that is equipped with corresponding size, both ends cover respectively about the light core board of middle part fretwork has layers of prepreg at least, prepreg, light core board and light core material form the light composite sheet after the hot pressing, the utility model provides a light composite sheet, the sandwich structure who is the light core material of foam through light core board and material has realized the requirement of light, forms the light composite sheet with prepreg, light core board and light core material after the hot pressing, has guaranteed the structural strength of light composite sheet, and this light composite sheet density is little, through the filler content that reduces the clad sheet, increases bonding effect to improve the intensity of composite sheet, reach bending strength and be greater than or equal to 270MPa requirement.

Description

kinds of foam sandwich light composite board

Technical Field

The utility model relates to a combined material technical field specifically is kinds of foam with filling light composite sheet.

Background

With the development of the technology in the field of consumer electronics, electronic products are developed to be lighter and thinner, and since the thinning of electronic products has been developed for many years, the space for the thinning development of materials has met the bottleneck, so that the reduction of the material density is also a feasible and effective way. Referring to CN 106633655A and CN 106739294A, the lowest density of the thermosetting resin ultra-low density laminate (hereinafter referred to as light board) is about 0.7g/cm³The density can not be further reduced, because the amount of the hollow glass microspheres actually hung on the prepreg in the gluing process has a limit value along with the increase of the amount of the hollow glass microspheres in the resin mixed solution, and the resin components are less and less along with the increase of the hollow glass microspheres in the resin mixed solution, the bonding force between layers of the plate after hot pressing is poorer and poorer, so that the density of the plate is difficult to be reduced continuously by continuously adding the hollow glass microspheres, and the density of the product needs to be reduced by other methods³The new lightweight board with bending strength larger than or equal to 270MPa is required to be types.

Disclosure of Invention

The utility model discloses an overcome the defect among the above-mentioned prior art, provide kinds of foam with filling light composite sheet, this light composite sheet quality is light, and density is little, and bending strength is high, and surface smoothness is high, the cohesiveness is good, can flood be applied to on the electronic consumer product, be favorable to this light composite sheet to push away and use on the market.

In order to achieve the purpose, the utility model adopts the following technical scheme that foam sandwich light composite boards are characterized by comprising a light core board with a hollow middle part, wherein a light core material with a corresponding size is embedded in the hollow middle part of the light core board, at least layers of prepregs are respectively covered at the upper end and the lower end of the light core board with the hollow middle part, and the prepregs, the light core board and the light core material are hot-pressed to form the light composite board.

As the utility model discloses an preferred schemes, light core board is formed by reinforcing material mixed glue solution of flooding through toasting, hot pressing solidification, and wherein, reinforcing material is or several in 1080 electronic glass cloth, 2116 electronic glass cloth, 2113 electronic glass cloth, the 7628 electronic glass cloth, and mixed glue solution is hollow glass microballon, long chain epoxy, curing agent, promoter and solvent.

As preferred schemes of the utility model, the prepreg is formed by the mixed liquid of reinforcing material impregnating resin and baking, wherein, the reinforcing material is selected from or several including 1080 electronic glass cloth, 2116 electronic glass cloth, 2113 electronic glass cloth, 7628 electronic glass cloth or S-level high-strength glass cloth, and the mixed liquid of resin is resin, curing agent, accelerant and solvent.

As the utility model discloses an preferred scheme, the prepreg is for not containing filler prepreg.

As the utility model discloses an preferred scheme, the prepreg is the filler-containing prepreg.

As the utility model discloses an preferred schemes, the thickness of prepreg is 0.05 ~ 0.3 mm.

As the preferred proposals of the utility model, the density of the light core board is 0.7-2.0 g/cm³The thickness is 0.1-5 mm。

As preferred solutions of the present invention, the lightweight core material is foam.

As preferred embodiments of the present invention, the foam is or more of PVC foam, PET foam, PMI foam or PI foam.

As the preferred proposals of the utility model, the density of the foam is 0.04-0.2 g/cm³。

Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a foam sandwich light composite sheet has realized the requirement of light through light core board and the sandwich structure for the light core material of foam, forms light composite sheet with prepreg, light core board and light core material after the hot pressing, has guaranteed light composite sheet's structural strength, and this light composite sheet density is little, through the filler content that reduces the clad laminate, increases bonding effect to improve the intensity of composite sheet, reach bending strength and be greater than or equal to 270MPa requirements.

Drawings

FIG. 1 is a schematic structural view of a foam sandwich light weight composite panel of example 1;

fig. 2 is a schematic view of the structure of the foam sandwich light composite panel in comparative example 1.

Reference numerals: 1. a prepreg; 2. a light core board; 3. a lightweight core material.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the accompanying drawings.

In an embodiment, as shown in fig. 1, foam sandwich light composite boards include a light core board 2, the light core board 2 is hollow in the middle, a light core material 3 with a corresponding size is embedded in the hollow in the middle of the light core board 2, the light core material 3 is foam, the foam is or more of PVC foam, PET foam, PMI foam or PI foam, at least layers of prepregs 1 are respectively coated on the upper end and the lower end of the light core board 2 hollow in the middle, and the prepregs 1, the light core board 2 and the light core material 3 are hot-pressed to form the light composite board.

The light core board 2 is formed by impregnating reinforcing materials with mixed glue solution, baking, hot-pressing and curing, wherein the reinforcing materials are or more of 1080 electronic glass cloth, 2116 electronic glass cloth, 2113 electronic glass cloth and 7628 electronic glass cloth, and the mixed glue solution is hollow glass microspheres, long-chain epoxy, epoxy resin, a curing agent, an accelerator and a solvent.

The prepreg 1 is formed by impregnating reinforcing materials with resin mixed liquor and baking, wherein the reinforcing materials are or more of 1080 electronic glass cloth, 2116 electronic glass cloth, 2113 electronic glass cloth, 7628 electronic glass cloth or S-level high-strength glass cloth, and the resin mixed liquor is resin, a curing agent, an accelerator and a solvent.

The prepreg 1 may be a filler-free prepreg, which is obtained by adding no filler component to the resin mixed glue solution, and has a better adhesive strength and a better bending strength after facing due to a high resin content, or a filler-containing prepreg, which is obtained by adding filler components in a certain proportion to the resin mixed glue solution, and has a slightly lower bending strength after facing than the filler-free prepreg, and therefore, the filler-free prepreg is preferred in this embodiment.

In this example, a film having a thickness of 0.8mm and a density of 0.8g/cm was used³The PMI foam with the corresponding size is embedded in the hollow hole in the middle of the light core plate 2, and the density of the PMI foam is 0.11g/cm³And the upper and lower parts are respectively covered with filler-free prepregs with the thickness of 0.1mm, the reinforcing material is 2116 electronic glass cloth, and the layers are hot pressed for 1.5h for forming by 100-150 h to obtain the foam sandwich light composite board with the thickness of 1.0mm, so that the light requirement is realized, and the density of the composite board is less than or equal to 0.55g/cm³(ii) a The bonding effect is improved by reducing the filler content of the covering prepreg, so that the strength of the composite board is improved, and the requirement that the bending strength is more than or equal to 270MPa is met.

If the thickness of the prepreg 1 is less than or equal to 0.05mm, the prepreg 1 is thin and is easy to damage, the prepreg 1 is difficult to cover, and the use of the light core board 2 is affected, and if the thickness of the prepreg 1 is more than or equal to 0.3mm, the prepreg 1 is thick, so that the weight of the composite board is heavy, and the requirement of light weight cannot be met.

If the density of the light core plate 2 is less than or equal to 0.7g/cm³And the thickness is less than or equal to 0.1mm, the structural strength of the light core plate 2 is poor, the use effect is not good, and if the density of the light core plate 2 is more than or equal to 2.0g/cm³And the thickness is more than or equal to 5mm, the weight of the light core plate 2 is heavy, and the requirement of reducing the weight of the composite plate cannot be met.

If the density of the foam is less than or equal to 0.04g/cm³The structural strength of the composite board passing through the foam filling part is poor, the use effect is not good, and if the density of the foam is more than or equal to 0.2g/cm³The composite plate is heavy, the bending strength cannot meet the requirement, and the effect of the composite plate is difficult to realize.

Example 2

The present embodiment is distinguished from embodiment 1 in that: the density of the PMI foams in the present example was 0.075g/cm³And the advantages of light weight and high structural strength of the composite board can be realized.

Example 3

The present embodiment is distinguished from embodiment 1 in that: the density of the PMI foam in this example was 0.052g/cm³And the advantages of light weight and high structural strength of the composite board can be realized.

Example 4

The present embodiment is distinguished from embodiment 1 in that: the foam in this example was a PET foam having a density of 0.11g/cm³And the advantages of light weight and high structural strength of the composite board can be realized.

Comparative example 1:

as shown in FIG. 2, in comparative example 1, PMI pure foam with the thickness of 0.8mm and the density of 0.11g/cm3 is used as a core board, the upper part and the lower part of the core board are respectively covered with filler-free prepregs (2116 cloth) with the thickness of 0.1mm, and the light foam sandwich glass fiber composite board with the thickness of 1.0mm is prepared after hot pressing for 1.5h for molding by 100-150.

Comparative example 2:

compared with the comparative example 1, the core board is characterized in that filler-containing prepregs (2116 cloth) with the thickness of 0.1mm are coated on the upper side and the lower side of the core board respectively, and the requirements of the bending strength of the product can not be met.

Compared with the comparative example 1, the core plate in the comparative example 1 is completely foamed, so that the edge bending strength and the compressive strength are very low, and the requirement that the bending strength of the light composite plate is not larger than 270MPa cannot be met, but the core plate is made of a combination of a light plate (with a hollow middle part) and the foamed material, and the edge bending strength of the core plate is not larger than 270MPa, so that the requirement can be met.

Examples 1, 2, 3 are compared with decreasing foam density (0.11 → 0.075 → 0.052 g/cm)³) The product density is lower and lower, and the weight is lighter and lighter.

In comparison with comparative example 2, the bending strength of the edge of the corresponding plate after the covering prepreg is hot-pressed without filler is better than that of the covering prepreg, which shows that the lower the filler content of the covering sheet, the better the bending strength.

Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention, and the invention is therefore not to be limited to the embodiments illustrated herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Although the terms 1, prepreg, 2, lightweight core, 3, lightweight core, etc. are used herein more often than not, the possibility of using other terms is not excluded, these terms are used only for the purpose of more conveniently describing and explaining the essence of the present invention, and they are to be construed as any additional limitations that are contrary to the spirit of the present invention.

Claims

The foam sandwich light composite board is characterized by comprising a light core board (2) with a hollow middle part, wherein a light core material (3) with a corresponding size is embedded in the hollow middle part of the light core board (2), at least layers of prepregs (1) are respectively covered at the upper end and the lower end of the light core board (2) with the hollow middle part, and the prepregs (1), the light core board (2) and the light core material (3) are subjected to hot pressing to form the light composite board.
2. The kinds of foam sandwich light-weight composite board of claim 1, wherein the light-weight core board (2) is formed by baking, hot-pressing and curing a reinforcing material dipping mixed glue solution.
3. The foam sandwich light-weight composite board according to claim 1 or 2, wherein the prepreg (1) is prepared by impregnating a reinforcing material with a resin mixture and baking.
4. The foam sandwich light-weight composite board according to claim 3, wherein the prepreg (1) is a filler-free prepreg.
5. The foam sandwich light-weight composite board according to claim 3, wherein the prepreg (1) is a filler-containing prepreg.
6. The foam sandwich light-weight composite board according to claim 4 or 5, characterized in that the thickness of the prepreg (1) is 0.05-0.3 mm.
7. The kinds of foam sandwich light-weight composite board as claimed in claim 6, wherein the density of the light-weight core board (2) is 0.7-2.0 g/cm³The thickness is 0.1-5 mm.
8. The foam sandwich light-weight composite board according to claim 7, wherein the light-weight core material (3) is foam.
9. The kinds of foam sandwich light-weight composite board of claim 8, wherein the foam has a density of 0.04-0.2 g/cm³。