Glass fiber composite fabric capable of being used as pultrusion radome side plate

Abstract

The utility model discloses a glass fiber composite fabric capable of being used as a pultrusion radome side plate, which comprises a polyester fiber felt layer, a double-sided reinforced polyester fiber cloth layer and a glass fiber multi-axial composite fabric layer, and the double-sided reinforced polyester fiber cloth layer is positioned between the polyester fiber felt layer and the glass fiber multi-axial composite fabric layer; and the polyester fiber felt layer, the double-sided reinforced polyester fiber cloth layer and the glass fiber multi-axial composite fabric layer are bonded by infiltrated resin paste. The polyester fiber felt and the double-sided reinforced polyester fiber cloth are used for replacing part of glass fiber reinforced materials, so that the weight is reduced, and meanwhile, the purpose of reducing the dielectric constant can be achieved. A resin-rich layer can be formed after the polyester fiber felt serving as the surface layer and the resin are cured, so that the surface compactness is improved, and water resistance and aging resistance are achieved; the double-sided reinforced polyester fiber cloth serving as the secondary outer layer provides structural rigidity; the glass fiber multi-axial composite fabric serving as the strength layer can give consideration to the strength and rigidity of the cover body in all directions.

Description

Technical Field

[0001] The utility model relates to a glass fiber composite fabric, in particular to a glass fiber composite fabric which can be used as a pultruded antenna cover side plate. Background Art

[0002] With the rapid promotion of 4G / 5G, the number of base stations has increased dramatically, and the demand for base station antenna covers has also soared. The antenna cover is a structure that protects the antenna system from the influence of the external environment. It has good electromagnetic wave penetration characteristics in electrical performance and can withstand the harsh external environment in mechanical performance.

[0003] The radome usually includes a cylindrical body with openings at both ends and an upper cover, which is installed above the body. From the perspective of the internal antenna, the radome body structure further includes a panel 100, two side panels 200 and a back panel 300. The panel 100 and the back panel 300 are connected by the left and right side panels 200 (such as Figure 2 as shown).

[0004] From the perspective of structure and performance, the panel 100 is one of the main paths for antenna signal radiation, and does not require high mechanical strength; the side panel 200 is one of the main paths for antenna signal radiation on the one hand, and on the other hand, provides structural stability and supporting strength for the antenna cover; the back panel 300 mainly serves as a fixed support for the antenna cover, and requires very high strength and crack resistance.

[0005] The applicant has continued to conduct research and development in this field, and has tried to use different composite materials in the panel, side panels and back panel parts of the radome, and has achieved good results.

[0006] The present application provides a glass fiber composite fabric suitable for use as a radome side panel. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a glass fiber composite fabric which can be used as a pultruded radome side plate.

[0008] The technical solution for achieving the purpose of the utility model is a glass fiber composite fabric that can be used as a pultruded antenna cover side panel, comprising a polyester fiber felt layer, a double-sided reinforced polyester fiber cloth layer and a glass fiber multi-axial composite fabric layer, the double-sided reinforced polyester fiber cloth layer is located between the polyester fiber felt layer and the glass fiber multi-axial composite fabric layer; the polyester fiber felt layer, the double-sided reinforced polyester fiber cloth layer and the glass fiber multi-axial composite fabric layer are bonded by impregnated resin paste.

[0009] Optionally, in the polyester fiber felt layer, the weight of each square meter of the polyester fiber felt is 20 g to 60 g.

[0010] The double-sided reinforced polyester fiber cloth used in the double-sided reinforced polyester fiber cloth layer is a polyester fiber cloth having polyester reinforcing ribs on both sides of the polyester fiber cloth.

[0011] As an option, the double-sided reinforced polyester fiber cloth has a weight of 60 g to 100 g per square meter.

[0012] In the glass fiber multi-axial composite fabric layer, the glass fibers are arranged in one or more layers at set angles of ±45° or 0°, 90°, ±45°, and then bound with stitching lines.

[0013] As an option, the glass fiber multi-axial composite fabric has a weight of 300 g to 800 g per square meter.

[0014] The utility model has positive effects:

[0015] The glass fiber composite fabric of the utility model comprises a polyester fiber felt layer, a double-sided reinforced polyester fiber cloth layer and a glass fiber multi-axial composite fabric layer. The polyester fiber felt and the double-sided reinforced polyester fiber cloth are used to replace part of the glass fiber reinforcement material, which can reduce the weight and also achieve the purpose of reducing the dielectric constant.

[0016] The polyester fiber felt used as the surface layer can form a resin-rich layer after curing with the resin, which increases the surface density and is waterproof and anti-aging; the double-sided reinforced polyester fiber cloth used as the sub-outer layer provides structural rigidity and can improve the stability of the antenna cover when used in the antenna cover structure; the glass fiber multi-axial composite fabric used as the strength layer can take into account the strength and rigidity of the cover in all directions.

[0017] When the glass fiber composite fabric of the utility model is used as the side panels of the radome, the side panels reduce the weight of the radome while ensuring the mechanical strength and optimize the dielectric constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the composite fabric of the utility model.

[0019] Figure 2 This is a schematic diagram of the application of the composite fabric of the utility model on the antenna cover.

[0020] The markings in the above drawings are as follows:

[0021] Polyester fiber felt layer 1, double-sided reinforced polyester fiber cloth layer 2, glass fiber multi-axial composite fabric layer 3, face plate 100, side plate 200, back plate 300. DETAILED DESCRIPTION

[0022] (Example 1)

[0023] See Figure 1 and Figure 2The glass fiber composite fabric that can be used as the side panel of the pultruded antenna cover in this embodiment includes a polyester fiber felt layer 1, a double-sided reinforced polyester fiber cloth layer 2 and a glass fiber multi-axial composite fabric layer 3, and the double-sided reinforced polyester fiber cloth layer 2 is located between the polyester fiber felt layer 1 and the glass fiber multi-axial composite fabric layer 3.

[0024] The polyester fiber felt layer 1, the double-sided reinforced polyester fiber cloth layer 2 and the glass fiber multi-axial composite fabric layer 3 are bonded by impregnated resin paste. The resin paste is prepared according to performance requirements. For example, the resin in the resin paste in this embodiment is unsaturated polyester resin.

[0025] The specification of the polyester fiber felt used in the polyester fiber felt layer 1 is 20 g / ㎡ to 60 g / ㎡, and 30 g / ㎡ and 45 g / ㎡ are conventionally selected.

[0026] The polyester fiber felt used in this embodiment is a 30 g / ㎡ polyester fiber felt of model N30 produced by Changzhou Zhongjie Company.

[0027] The specification of the double-sided reinforced polyester fiber cloth used in the double-sided reinforced polyester fiber cloth layer 2 is 60 g / ㎡ to 100 g / ㎡, and 60 g / ㎡ and 80 g / ㎡ are conventionally selected.

[0028] The double-sided reinforced polyester fiber cloth is a polyester fiber cloth with polyester reinforcing ribs on both sides of the polyester fiber cloth.

[0029] The double-sided reinforced polyester fiber cloth used in this embodiment is a 60 g / ㎡ double-sided reinforced polyester fiber cloth of NL60 model produced by Changzhou Zhongjie Company.

[0030] In the glass fiber multi-axial composite fabric used in the glass fiber multi-axial composite fabric layer 3, the glass fibers are arranged in one or more layers at set angles such as ±45° or 0°, 90°, ±45°, and then bound with stitching lines.

[0031] The specification of the glass fiber multi-axial composite fabric is 300 g / ㎡ to 800 g / ㎡, and 400 g / ㎡ and 450 g / ㎡ are conventionally selected.

[0032] In this embodiment, the glass fiber multi-axial composite fabric is a 400 g / ㎡ glass fiber multi-axial composite fabric of model EBX400 produced by Changzhou Zhongjie Company.

[0033] When processing the composite fabric of the utility model, the polyester fiber felt, the polyester fiber cloth, and the glass fiber multi-axial composite fabric are respectively unwound from the creel, the glass fiber multi-axial composite fabric enters the dipping tank to be impregnated with the resin paste, and when it comes out of the dipping tank, it enters the preforming mold together with the double-sided reinforced polyester fiber cloth and the polyester fiber felt. While impregnating the double-sided reinforced polyester fiber cloth and the polyester fiber felt, the excess resin is squeezed out, and the composite fabric of the utility model is obtained after coming out of the preforming mold.

[0034] When used to make an antenna cover, the above-mentioned composite fabric is placed in the side panel forming position of the mold. After the above-mentioned composite fabric and the materials of the panel and the back panel are overlapped with each other, it is heated, reacted and cured, and then pulled out of the mold by a traction machine. It is cut online according to the required length of the antenna cover to obtain a finished antenna cover.

[0035] (Test example)

[0036] The composite fabric of Example 1 and the composite fabric of the comparative example were used as the side panels of the radome and then tested after being cured.

[0037] The resin paste is composed of unsaturated polyester resin and additives, including low shrinkage additive LSA, curing agent, internal mold release agent, colorant and filler. The mass of low shrinkage additive is 15% of the mass of unsaturated polyester resin, the mass of curing agent is 1.5% of the mass of unsaturated polyester resin, the mass of internal mold release agent is 4% of the mass of unsaturated polyester resin, and the mass of colorant is 4% of the mass of unsaturated polyester resin. The unsaturated polyester resin is HS2252 of Huake Polymer Company; the low shrinkage additive is HS955 of Huake Polymer Company; the curing agent is TBPB and TBPO of Akzo Company; the internal mold release agent is SAK-ZS-PLB of Sanyi Company.

[0038] The composite fabric of the comparative example is obtained by impregnating glass fiber mat and roving with resin paste, and the glass fiber mat used is 380 g / ㎡ glass fiber knitted mat and 2400 tex roving.

[0039] The composite materials of Example 1 and the comparative example were molded as the side plate 200 in the antenna cover mold, and the mechanical properties were tested. The results are as follows:

[0040] Test Item Test Standard Radome Part Comparative Example Example 1

[0041] Tensile strength MPa GBT1447 Side plate 118 111

[0042] Flexural modulus MPa GBT1449 Side panel 189 191

[0043] It can be seen from the results that when used as the radome side plate 200, the composite material of the present invention meets the mechanical strength requirements, and due to the reduced amount of glass fiber, the dielectric constant is lower than that of the all-glass fiber structure.

Claims

1. A glass fiber composite fabric that can be used as a pultruded radome side panel, characterized in that: The invention comprises a polyester fiber felt layer (1), a double-sided reinforced polyester fiber cloth layer (2) and a glass fiber multi-axial composite fabric layer (3); the double-sided reinforced polyester fiber cloth layer (2) is located between the polyester fiber felt layer (1) and the glass fiber multi-axial composite fabric layer (3); and the polyester fiber felt layer (1), the double-sided reinforced polyester fiber cloth layer (2) and the glass fiber multi-axial composite fabric layer (3) are bonded by impregnated resin paste.

2. The glass fiber composite fabric used as a pultruded radome side panel according to claim 1, characterized in that: In the polyester fiber felt layer (1), the weight of the polyester fiber felt per square meter is 20 g to 60 g.

3. The glass fiber composite fabric used as a pultruded radome side panel according to claim 1, characterized in that: The double-sided reinforced polyester fiber cloth used in the double-sided reinforced polyester fiber cloth layer (2) is a polyester fiber cloth having polyester reinforcing ribs on both sides of the polyester fiber cloth.

4. The glass fiber composite fabric used as a pultruded radome side panel according to claim 3, characterized in that: The weight of double-sided reinforced polyester fiber cloth is 60 g to 100 g per square meter.

5. The glass fiber composite fabric used as a pultruded radome side panel according to claim 1, characterized in that: In the glass fiber multi-axial composite fabric layer (3), the glass fibers are arranged in one or more layers at set angles of ±45° or 0°, 90°, ±45°, and then bound using stitching lines.

6. The glass fiber composite fabric used as a pultruded radome side panel according to claim 5, characterized in that: The weight of glass fiber multi-axial composite fabric is 300 g to 800 g per square meter.

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