A quasi-mirror glass fiber reinforced plastic sheet containing a cloth base for RVs and its preparation method and application

Abstract

The present invention relates to a quasi-mirror fiberglass sheet material containing a cloth base for RVs and a preparation method and application thereof, and relates to the technical field of fiberglass composite panels. The quasi-mirror fiberglass sheet material containing a cloth base for RVs comprises a base layer, the base layer comprises a reinforcing layer, a continuous reinforcing layer and a base resin layer, the reinforcing layer and the continuous reinforcing layer are both infiltrated in the base resin layer; the material of the reinforcing layer comprises a felt-based material; the material of the continuous reinforcing layer comprises a pre-impregnated cloth-based material; the raw material of the base resin layer comprises an unsaturated polyester resin, and at least one of a skeleton material, a low shrinkage agent, an initiator, an inhibitor, and a curing agent I. The quasi-mirror fiberglass sheet material containing a cloth base for RVs of the present invention can avoid the problems of low strength and obvious texture of felt-based RV panels.

Description

Technical Field

[0001] The invention relates to the technical field of glass fiber reinforced plastic composite panels, and in particular to a quasi-mirror glass fiber reinforced plastic sheet containing a cloth base for recreational vehicles, and a preparation method and application thereof. Background Art

[0002] FRP RV panels refer to glass fiber reinforced thermosetting plastic composite flat panels used in the RV field. The advantages of RV panels are light weight, high thermal insulation performance, and the ability to produce a variety of colors to meet market needs. At present, all FRP RV panels in the world are felt-based (especially for self-propelled RVs) because cloth-based FRP RV panels have surface texture problems. In the field of continuous pultrusion board making, the advantage of using glass fiber felt is that the irregular texture on its surface will not form obvious regular textures after resin infiltration, and the discontinuous stress of the glass fiber felt will offset in the main direction, so the flatness of the RV panel surface can be maintained to the greatest extent. However, the glass fiber felt reinforced material has a serious problem of low mechanical strength. Its discontinuity leads to a reduction in force, resulting in a decrease in the overall mechanical strength of the panel.

[0003] In order to improve the mechanical strength, fiber fabrics need to be added to the reinforcing materials. The fiber fabrics are mainly continuous vertical and horizontal checkered cloths. The fiber content is increased, but the texture is prominent. Because of the stress continuity of the fiber fabrics, the stress is superimposed in the main direction, and the resin shrinks seriously, which makes the surface aesthetics of the board poor and the gel coat surface has regular unevenness. At present, traditional processes cannot solve the surface texture. In particular, many RVs are limited by the insufficient strength of traditional RV panels. They either use low-efficiency hand-laid fiberglass panels or change to aluminum body panels. However, aluminum panels are heavy and have poor thermal insulation performance.

[0004] For cloth-based materials, their longitudinal and transverse characteristics make the mainstream traditional processes on the market have little effect. In view of this, the present invention provides a quasi-mirror-surface cloth-based RV glass fiber reinforced plastic sheet and its preparation method and application. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a quasi-mirror fiberglass sheet containing cloth as a base for RVs and its preparation method and application. The purpose is to provide a fiberglass RV board with a light cloth texture, avoiding the problems of low strength and obvious texture of felt-based RV boards.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] In a first aspect, a quasi-mirror fiberglass plate material containing a cloth base for RVs, the quasi-mirror fiberglass plate material containing a cloth base for RVs comprising a base layer, the base layer comprising a reinforcing layer, a continuous reinforcing layer and a base resin layer, the reinforcing layer and the continuous reinforcing layer being impregnated in the base resin layer; the material of the reinforcing layer comprises a felt-based material; the material of the continuous reinforcing layer comprises a pre-impregnated cloth-based material;

[0008] The raw materials of the base resin layer include unsaturated polyester resin, and at least one of a skeleton material, a low shrinkage agent, an initiator, an inhibitor, and a curing agent I.

[0009] The beneficial effects of the present invention are as follows: by adopting a pre-impregnated cloth base material and then impregnating it with a matrix resin layer, the matrix resin layer is gradually solidified. On the one hand, the material of the continuous reinforcement layer is more fully connected at the microscopic level, and during molding, the internal direction is subjected to shrinkage force to offset the fiber force in the reinforcement material of the continuous reinforcement layer, thereby increasing the resistance of the glass fiber reinforced plastic sheet itself and further increasing the mechanical properties. On the other hand, the gradual solidification of the matrix resin layer fills the material gaps in the reinforcement layer and significantly levels it, thereby improving the texture, thereby avoiding the problems of low strength and obvious texture of felt-based RV panels.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Further, the weight ratio of the reinforcement layer to the continuous reinforcement layer is 3-26:4-20;

[0012] The pre-impregnated cloth base material is made into a continuous reinforcement layer by impregnating the cloth base material with a prepreg resin; the weight ratio of the cloth base material to the prepreg resin is 20-80:20-80; the cloth base material includes at least one of gingham cloth, glass fiber cloth, multi-axial cloth, warp knitted cloth, and composite cloth; the prepreg resin is at least one of orthophthalic unsaturated polyester resin, isophthalic unsaturated polyester resin, isophthalic neopentyl glycol unsaturated polyester resin, and vinyl resin;

[0013] The felt-based material includes at least one of surface felt, glass fiber chopped yarn, chopped strand mat, glass fiber felt, carbon fiber, basalt fiber, stitched felt, and composite felt.

[0014] Furthermore, the matrix resin layer comprises the following raw materials in parts by weight: 80-120 parts of unsaturated polyester resin, 1-35 parts of skeleton material, 1-20 parts of low shrinkage agent, 0-2 parts of initiator, 0-2 parts of inhibitor, and 1-2 parts of curing agent I;

[0015] The unsaturated polyester resin includes at least one of orthophthalic unsaturated polyester resin, isophthalic unsaturated polyester resin, isophthalic neopentyl glycol unsaturated polyester resin and vinyl resin.

[0016] The beneficial effect of adopting the above further solution is that the matrix resin layer is the core part of the board, and the optimization of this solution increases the contact area between the matrix resin and the gel coat layer, and shrinks less when heated, and the surface texture is finer.

[0017] Furthermore, the skeleton material is at least one of aluminum hydroxide, diatomaceous earth, talc, kaolin, hollow microspheres, cellulose, ceramic powder, mica, and pearl powder;

[0018] The low shrinkage agent includes at least one of PE powder, PVAc-St and PMMA;

[0019] The initiator is at least one of a cobalt-based initiator and BPO;

[0020] The inhibitor is at least one of DPPH, TBC, phenol and ferric chloride;

[0021] The curing agent I is at least one of methyl ethyl ketone peroxide, methyl ethyl diketone peroxide, and dibenzoyl peroxide.

[0022] The beneficial effects of adopting the above further scheme are: by selecting the above materials, the heat released by the board during gelation can provide continuous solidification, maintain the degree of solidification of the board, and improve various performances of the board; the above skeleton material can disperse stress and reduce shrinkage.

[0023] Furthermore, the quasi-mirror cloth-based RV FRP sheet material also includes a gel coat resin layer, which is arranged on the upper surface and / or lower surface of the base layer; the thickness of the gel coat resin layer is 0.5±0.1 mm, and the thickness of the base layer is 1.5±0.5 mm.

[0024] The beneficial effect of adopting the above further solution is that the gel coat resin layer has good adhesion, which is conducive to the preparation of shallow cloth texture of the board.

[0025] Furthermore, the gel coat resin layer comprises the following raw materials in parts by weight: 80-120 parts of unsaturated polyester resin gel coat, 1.6-2.4 parts of curing agent II; wherein the unsaturated polyester resin in the gel coat resin layer comprises at least one of orthophthalic unsaturated polyester resin, isophthalic unsaturated polyester resin, isophthalic neopentyl glycol unsaturated polyester resin, and vinyl resin;

[0026] The curing agent II is at least one of methyl ethyl ketone peroxide and cumene hydroperoxide.

[0027] The beneficial effect of adopting the above further scheme is that the gel coat adopts isophthalic unsaturated polyester resin type gel coat, and the molecular bond connection is more stable and the hardness is greater during polymerization (curing), so the fiber texture is difficult to show through the gel coat.

[0028] In a second aspect, a method for preparing a quasi-mirror fiberglass sheet containing a cloth base for a recreational vehicle comprises the following steps:

[0029] (1) preparing raw materials for a gel coat resin layer to obtain a gel coat resin layer coating, applying the gel coat resin layer coating to a base mold, and baking and curing the coating to obtain a gel coat resin layer;

[0030] (2) The raw materials of the base resin layer are prepared to obtain a base resin layer coating, and the base resin layer coating is applied to the gel coat resin layer, and then a reinforcement layer and a continuous reinforcement layer are placed, and then the process is sequentially carried out through impregnation, film covering, thickness determination, baking and curing, edge trimming, bottom mold collection and film covering to obtain a quasi-mirror-surface fiberglass sheet containing a cloth base for RVs.

[0031] In addition, in step (2), when necessary, the material is supplemented; the thickness is adjusted by thickness setting; and the trimming is performed, that is, according to the production requirements, the two sides are cut off to leave the corresponding specification plate; that is, the preparation method of the quasi-mirror fiberglass plate containing cloth base for RV of the present invention can include four feedings, namely: the first feeding: gel coat coating; the second feeding: substrate coating; the third feeding: fiber cloth impregnation; the fourth feeding: supplementing.

[0032] Film collection is carried out, that is, the bottom film of the gel coat surface is recycled; protective film is applied, that is, the gel coat surface of the composite board is protected by film; cross-cutting is carried out, that is, according to production requirements, the corresponding specifications are achieved; board collection is carried out, that is, the boards are stacked and packaged according to production requirements; and rolling is carried out, that is, the boards are rolled according to production requirements.

[0033] The beneficial effect of adopting the above solution is that the substrate surface of the plate is made smoother, thereby reducing the reverse influence of the substrate surface on the gel coat resin layer.

[0034] Furthermore, in step (1), the temperature of the upper and lower layers during baking and curing is 60-100°C, and the time is 18-25 minutes;

[0035] Placing the reinforcement layer and the continuous reinforcement layer in step (2) specifically includes: placing the reinforcement layer first, and then placing the continuous reinforcement layer; or placing the reinforcement layer and the continuous reinforcement layer alternately in sequence;

[0036] In step (2), the temperature of the upper and lower layers during baking and curing is 80-100°C, and the time is 16-20 minutes; or the temperature of the upper layer during baking and curing is 60-80°C, and the temperature of the lower layer during baking and curing is 80-100°C, and the time is 16-20 minutes.

[0037] Furthermore, the preparation process of the continuous reinforcement layer is specifically as follows: placing the cloth base material in a temperature-adjustable material pool, taking it out after being impregnated with a resin, and obtaining a pre-impregnated cloth base material, namely the continuous reinforcement layer.

[0038] The beneficial effect of adopting the above further scheme is: after impregnation, a layer of resin will adhere to the surface of the cloth-based material, and this resin will make the concave and convex parts of the cloth-based material surface shallower, and after being applied to the board, the cloth texture of the board will become lighter; through the combination of different amounts of reinforcing materials, the difference in mechanical properties of the board in different directions is reduced, and the gaps between the fiber filaments are filled, which plays an important role in the surface texture of the board.

[0039] In a third aspect, a quasi-mirror-like fiberglass sheet material containing a cloth base for RVs is used to prepare RV panels.

[0040] The beneficial effect of adopting the above scheme is that the quasi-mirror cloth-based RV fiberglass sheet not only solves the problem of low mechanical properties of traditional RV panels, but also solves the problem of obvious texture of traditional cloth-based fiberglass sheets, making the RV made of this sheet more sturdy and durable, and the surface is more beautiful and generous, without the need for surface treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a tensile modulus diagram of Example 1 of the present invention;

[0042] Figure 2 is a tensile modulus diagram of comparative example 1 of the present invention;

[0043] Figure 3 This is a schematic diagram of the plate structure of the present invention;

[0044] Figure 4 A schematic diagram of the structure of the arrangement of the reinforcing layer and the continuous reinforcing layer in the gel coat resin layer and the base layer in Example 1 of the present invention;

[0045] Figure 5 A schematic structural diagram of the arrangement of the reinforcing layer and the continuous strengthening layer in the gel coat resin layer and the base layer in Example 3 of the present invention. DETAILED DESCRIPTION

[0046] The principles and features of the present invention are described below, and the examples are only used to explain the present invention and are not used to limit the scope of the present invention. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in this field or the product instructions are used. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased through regular channels.

[0047] Example 1

[0048] The present embodiment relates to a quasi-mirror fiberglass sheet material containing a cloth base for RVs, wherein the quasi-mirror fiberglass sheet material containing a cloth base for RVs comprises a base layer and a gel coat resin layer ( Figure 3 and Figure 4); the base layer comprises a reinforcing layer, a continuous reinforcing layer and a base resin layer, the reinforcing layer and the continuous reinforcing layer are impregnated in the base resin layer; the material of the reinforcing layer comprises a felt-based material;

[0049] The gel coat resin layer: 100 parts by weight of unsaturated polyester resin gel coat (Ashilan gel coat), and the curing agent is 2 parts by weight of methyl ethyl ketone peroxide; the unsaturated polyester resin gel coat is an isophthalic unsaturated polyester resin gel coat;

[0050] The reinforcing layer comprises: 1 part by weight of surface felt, 5 parts by weight of glass fiber chopped yarn, and 10 parts by weight of glass fiber felt.

[0051] The continuous reinforcement layer: 15 parts by weight of pre-impregnated fiber cloth;

[0052] The base resin layer comprises: 100 parts by weight of isophthalic unsaturated polyester resin (Tianhe 106 resin), 6.5 parts by weight of cellulose, 2 parts by weight of pearl powder and 8.5 parts by weight of mica as skeleton materials; 10 parts by weight of PE powder as low shrinkage agent, and 1.2 parts by weight of cobalt-based initiator as initiator; the inhibitor comprises DPPH, TBC, phenol and ferric chloride, and the mass ratio of TBC, DPPH, ferric chloride and phenol is 1:0.75:0.5:1.23; and the curing agent comprises 2 parts by weight of methyl ethyl ketone peroxide.

[0053] This embodiment relates to a method for preparing a quasi-mirror-surface cloth-based RV glass fiber reinforced plastic sheet, comprising the following steps:

[0054] (1) preparing raw materials for a gel coat resin layer to obtain a gel coat resin layer coating, applying the gel coat resin layer coating to a base mold, and baking and curing the coating to obtain a gel coat resin layer;

[0055] (2) The raw materials of the base resin layer are prepared to obtain a base resin layer coating, the base resin layer coating is applied to the gel coat resin layer, and then a reinforcement layer and a continuous reinforcement layer are placed, and then the process is sequentially carried out through impregnation, film covering, thickness determination, baking and curing, edge trimming, bottom mold collection and film covering to obtain a quasi-mirror-surface fiberglass sheet containing a cloth base for RVs.

[0056] The temperature of the upper and lower layers during baking and curing in step (1) is 90°C and the time is 22 minutes;

[0057] Placing the reinforcement layer and the continuous reinforcement layer in step (2) specifically includes: first placing the surface felt, the glass fiber chopped yarn, the glass fiber felt in sequence, and then placing the pre-impregnated fiber cloth;

[0058] The temperature of the upper and lower layers during baking and curing in step (2) is 80°C and the time is 18 minutes.

[0059] The impregnation process of the pre-impregnated fiber cloth is specifically as follows: placing the fiber cloth in a temperature-adjustable material pool, and taking it out after being impregnated with the impregnation resin; the impregnation resin is a vinyl resin and isophthalic neopentyl glycol resin; the weight ratio of the vinyl resin to the isophthalic neopentyl glycol resin is 3:1; the weight ratio of the fiber cloth to the impregnation resin is 1:1;

[0060] In step (2), the material is supplemented when necessary; the thickness is adjusted by thickness setting; and the edges are trimmed, that is, the two edges are cut off according to production requirements to leave the corresponding specification plate.

[0061] Film collection is carried out, that is, the bottom film of the gel coat surface is recycled; protective film is applied, that is, the gel coat surface of the composite board is protected by film; cross-cutting is carried out, that is, according to production requirements, the corresponding specifications are achieved; board collection is carried out, that is, the boards are stacked and packaged according to production requirements; and rolling is carried out, that is, the boards are rolled according to production requirements.

[0062] Example 2

[0063] Except that the continuous reinforcement layer is placed between the glass fiber chopped strands and the glass fiber mat, the rest is the same as Example 1.

[0064] Example 3

[0065] In addition to the reinforcing layer: 1 part by weight of surface felt, 20 parts by weight of glass fiber felt, the continuous reinforcing layer: 8 parts by weight of composite cloth, 8 parts by weight of multi-axial cloth, the placement of the reinforcing layer and the continuous reinforcing layer specifically includes: placing the surface felt, the composite cloth after pre-impregnation, the glass fiber felt, and the multi-axial cloth after pre-impregnation in sequence; the impregnation resin is vinyl resin ( Figure 3 and Figure 5 ).

[0066] In step (2), the baking curing temperature is 60°C for the upper layer and 90°C for the lower layer.

[0067] The rest is the same as Example 1.

[0068] Comparative Example 1

[0069] The same as in Example 1, except that the pre-impregnated glass fiber cloth is not used, and the rest is the same as in Example 1.

[0070] Test example

[0071] (1) Mechanical properties

[0072] Tensile strength is tested according to GB / T1447-2005, test speed: 2 mm / min.

[0073] (2) Roughness

[0074] Surface roughness is tested in accordance with GB / T 14234-1993.

[0075] Table 1 Tensile test results of Example 1

[0076]

[0077] Table 2 Tensile test of comparative example 1

[0078]

[0079] From Table 1-2 and Figure 1 and 2 It can be seen from the tensile test that the glass fiber cloth shown in Control Example 1 without impregnation resin has low tensile strength and low modulus, and its mechanical properties are relatively poor.

[0080] Table 3 Tensile test results of Example 2

[0081]

[0082] It can be seen from the experimental data of Example 2 (Table 3) that when the fiber cloth ply is changed, it has little effect on the mechanical properties of the board, but placing the cloth base material first will make the cloth texture obvious.

[0083] Table 4 Tensile test results of Example 3

[0084]

[0085] It can be seen from the experimental results of Example 3 (Table 4) that the mechanical properties of the plate obtained by overlapping the continuous reinforcement layer and the enhancement layer are greatly improved, meeting the use requirements.

[0086] Table 5 Surface roughness comparison

[0087]

[0088] It can be seen from Table 5 that after the fiber cloth pre-impregnated in the impregnation tank is added, the surface roughness is greatly reduced. When the position of the pre-impregnated fiber cloth is replaced and other pre-impregnated multi-axial cloths are added, the surface roughness is also lower than that of the glass fiber cloth without pre-impregnation, indicating that the quasi-mirror-like cloth-based RV fiberglass sheet of the present invention has a smooth surface and is easy to use.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0090] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A quasi-mirror fiberglass sheet containing a cloth base for RVs, characterized in that: The quasi-mirror surface cloth-based RV FRP sheet material comprises a base layer, the base layer comprises a reinforcing layer, a continuous reinforcing layer and a base resin layer, the reinforcing layer and the continuous reinforcing layer are impregnated in the base resin layer; the material of the reinforcing layer comprises a felt-based material; the material of the continuous reinforcing layer comprises a pre-impregnated cloth-based material; The base resin layer comprises the following raw materials in parts by weight: 80-120 parts of unsaturated polyester resin, 1-35 parts of skeleton material, 1-20 parts of low shrinkage agent, 0-2 parts of initiator, 0-2 parts of polymerization inhibitor, and 1-2 parts of curing agent I; the impregnation resin is isophenyl neopentyl glycol type unsaturated polyester resin and vinyl resin; The unsaturated polyester resin in the base resin layer includes at least one of an orthophthalic unsaturated polyester resin and an isophthalic unsaturated polyester resin; The preparation process of the continuous reinforcement layer is specifically as follows: placing the cloth base material in a temperature-adjustable material pool, taking it out after being soaked in a pre-impregnated resin, and obtaining a pre-impregnated cloth base material, which is the continuous reinforcement layer; The quasi-mirror surface cloth-based RV FRP sheet material further comprises a gel coat resin layer, which is arranged on the upper surface and / or the lower surface of the base layer; the thickness of the gel coat resin layer is 0.5±0.1 mm, and the thickness of the base layer is 1.5±0.5 mm; The method for preparing a quasi-mirror-surface cloth-based RV glass fiber reinforced plastic sheet comprises the following steps: (1) preparing raw materials for a gel coat resin layer to obtain a gel coat resin layer coating, applying the gel coat resin layer coating to a base mold, and baking and curing the coating to obtain a gel coat resin layer; (2) preparing the raw materials of the base resin layer to obtain a base resin layer coating, applying the base resin layer coating to the gel coat resin layer, and then placing a reinforcement layer and a continuous reinforcement layer, and then sequentially performing impregnation, film covering, thickness determination, baking and curing, edge trimming, bottom mold closing and film covering to obtain a quasi-mirror surface cloth-based RV FRP sheet; The temperature of the upper and lower layers during baking and curing in step (1) is 60-100°C and the time is 18-25 minutes; Placing the reinforcement layer and the continuous reinforcement layer in step (2) specifically includes: placing the reinforcement layer first, and then placing the continuous reinforcement layer; or placing the reinforcement layer and the continuous reinforcement layer alternately in sequence; In step (2), the temperature of the upper and lower layers during baking and curing is 80-100°C, and the time is 16-20 minutes; or the temperature of the upper layer during baking and curing is 60-80°C, and the temperature of the lower layer during baking and curing is 80-100°C, and the time is 16-20 minutes.

2. The quasi-mirror fiberglass sheet containing cloth as claimed in claim 1, characterized in that: The weight ratio of the reinforcement layer to the continuous reinforcement layer is 3-26:4-20; The pre-impregnated cloth base material is made into a continuous reinforcement layer by impregnating the cloth base material with the impregnation resin; the weight ratio of the cloth base material to the impregnation resin is 20-80:20-80; the cloth base material includes at least one of gingham cloth, glass fiber cloth, multi-axial cloth, warp knitted cloth, and composite cloth; The felt-based material includes at least one of surface felt, glass fiber chopped yarn, chopped strand mat, glass fiber felt, carbon fiber, basalt fiber, stitched felt, and composite felt.

3. The quasi-mirror fiberglass sheet containing cloth as claimed in claim 1, characterized in that: The skeleton material is at least one of aluminum hydroxide, diatomaceous earth, talc, kaolin, hollow microspheres, cellulose, ceramic powder, mica, and pearl powder; The low shrinkage agent includes at least one of PE powder, PVAc-St and PMMA; The initiator is at least one of a cobalt-based initiator and BPO; The inhibitor is at least one of DPPH, TBC, phenol and ferric chloride; The curing agent I is at least one of methyl ethyl ketone peroxide, methyl ethyl diketone peroxide, and dibenzoyl peroxide.

4. The quasi-mirror surface cloth-based RV glass fiber reinforced plastic sheet according to claim 1, characterized in that: The gel coat resin layer comprises the following raw materials in parts by weight: 80-120 parts of unsaturated polyester resin and 1.6-2.4 parts of curing agent II; The curing agent II is at least one of methyl ethyl ketone peroxide and cumene hydroperoxide.

5. An application of a quasi-mirror fiberglass sheet containing a cloth base for RVs, characterized in that: The quasi-mirror-surface cloth-based RV glass fiber reinforced plastic sheet material as described in any one of claims 1 to 4 is used to prepare RV panels.

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