Dacron reinforced unsaturated polyester resin carriage flat plate and preparation method thereof

Abstract

The invention relates to the technical field of high polymer material preparation, and discloses a terylene reinforced unsaturated polyester resin carriage flat plate and a preparation method thereof, the preparation method comprises the following steps: (1) mixing gel coat resin and a curing agent A, uniformly coating a polyester film with the mixture, and curing to form a gel coat layer; (2) uniformly mixing unsaturated polyester resin, a curing agent B and a coupling agent to form a modified unsaturated polyester resin mixed solution, and then coating the gel coat layer with the modified unsaturated polyester resin mixed solution; (3) polyester fiber cloth is laid on the gel coat layer coated with the modified unsaturated polyester resin mixed solution, so that the polyester fiber cloth is completely infiltrated by the modified unsaturated polyester resin mixed solution, and an uncured enhancement layer is formed; and (4) covering the uncured enhancement layer with a polyester film, exhausting air, and then curing to obtain the composite material. The carriage flat plate obtained through the preparation method has the advantages of being high in quality and strength and good in toughness, fuel oil is saved, meanwhile, the carriage flat plate can be recycled for secondary utilization, and environment friendliness is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of polymer material preparation, in particular to a polyester reinforced unsaturated polyester resin carriage flat plate and a preparation method thereof. Background Art

[0002] With the development of the express delivery industry and the cold chain transportation industry in recent years, the market volume of special vehicles such as dry truck compartments, logistics compartments, and refrigerated trucks has become increasingly larger. The requirements for light weight and high strength of the compartment panels used in these vehicles have become increasingly prominent. They must not only meet the requirements for high body strength, but also reduce the body weight as much as possible in order to carry more goods, save fuel, and achieve the highest economic benefits.

[0003] At present, the common car body panels in refrigerated trucks, logistics trucks, RVs, dry trucks and other vehicles on the market are glass fiber reinforced unsaturated polyester resin gel-coated flat panels. Although glass fiber has high strength, it has a high density of about 2.2-2.6g / cm 3 The density of conventional glass fiber flat plate is 1.5g / cm 3 The density of glass fiber accounts for about 25-30% of the weight of the flat panel. For the automotive industry, which requires lightweighting, strength and weight are very critical. In addition, as a car body panel, the glass fiber board has high strength but poor toughness, is not impact-resistant, and is difficult to recycle after being discarded, which can easily cause environmental pollution. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a polyester reinforced unsaturated polyester resin car compartment flat plate and a preparation method thereof, wherein the prepared car compartment flat plate has low density, high strength and improved impact resistance.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a method for preparing a polyester reinforced unsaturated polyester resin carriage flat panel, which is characterized by comprising:

[0006] (1) mixing a gel coat resin and a curing agent A, coating the mixture evenly on a polyester film, and curing the mixture to form a gel coat layer;

[0007] (2) uniformly mixing the unsaturated polyester resin, the curing agent B and the coupling agent to form a modified unsaturated polyester resin mixed solution, and then coating the mixed solution on the gel coat layer;

[0008] (3) laying a polyester fiber cloth on the gel coat layer coated with the modified unsaturated polyester resin mixed solution, so that the modified unsaturated polyester resin mixed solution completely infiltrates the polyester fiber cloth to form an uncured reinforcement layer;

[0009] (4) Cover the uncured reinforcing layer with a polyester film, exhaust the air, and then cure to obtain the product.

[0010] As an improvement of the above scheme, the density of the polyester reinforced unsaturated polyester resin carriage flat plate is 1.2-1.3 g / cm 3 .

[0011] As an improvement of the above scheme, the added mass of the unsaturated polyester resin per mm thickness is 0.7-1.1 kg / m 2 The added mass of the coupling agent is 0.5-1% of the added mass of the unsaturated polyester resin;

[0012] The coupling agent is an organic silicon coupling agent.

[0013] As an improvement of the above scheme, the coupling agent is 3-aminopropyltrimethoxysilane and polyethylene glycol trimethoxysilyl propyl ether, and the addition mass ratio of the 3-aminopropyltrimethoxysilane and polyethylene glycol trimethoxysilyl propyl ether is 1:(0.7-1.5).

[0014] As an improvement of the above scheme, the added mass of the polyester fiber cloth per mm thickness is 0.2-0.65 kg / m 2 .

[0015] As an improvement of the above solution, the added mass of the polyester fiber cloth per mm thickness is 15-35% of the added mass of the unsaturated polyester resin.

[0016] As an improvement of the above solution, the water absorption rate of the polyester fiber cloth is 0.3-0.6%, and the relative density of the polyester fiber cloth is 1.3-1.4 g / cm 3 ;

[0017] The breaking elongation of the polyester fiber cloth is 40-50%.

[0018] As an improvement of the above solution, the added mass of the curing agent B is 0.7-3% of the added mass of the unsaturated polyester resin; and the curing agent includes methyl ethyl ketone peroxide.

[0019] As an improvement of the above scheme, in step (4), curing is carried out by heating, wherein the heating temperature is 70 to 90°C.

[0020] The second aspect of the present invention further provides a polyester reinforced unsaturated polyester resin carriage flat panel, which is prepared according to the preparation method of the polyester reinforced unsaturated polyester resin carriage flat panel.

[0021] The implementation of the present invention has the following beneficial effects:

[0022] 1. The present invention improves the problem of high density of glass fiber reinforced unsaturated resin compartment panels. The compartment flat panel obtained by using polyester fiber cloth to reinforce unsaturated resin is light in weight and has a density of 1.2-1.3 g / cm3 , which can greatly reduce the weight of the car and save fuel.

[0023] 2. The present invention improves the problem that the glass fiber reinforced unsaturated resin compartment panel has high strength but poor toughness. The compartment flat panel obtained by using polyester fiber cloth to reinforce the unsaturated resin has high strength, a tensile strength of more than 70MPa, a bending strength of more than 95MPa, good toughness, strong impact resistance, and an impact strength of up to 35KJ / m 2 The above can provide good protection for the transported goods in the carriage.

[0024] 3. The present invention solves the problem that glass fiber reinforced unsaturated resin car body panels are difficult to recycle and easily cause environmental pollution. The polyester fiber in the car body flat panel obtained by using polyester fiber cloth to reinforce unsaturated resin can be degraded back to raw materials together with unsaturated polyester resin at high temperature, and can be recycled for secondary use, which is green and environmentally friendly. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with specific embodiments below.

[0026] In order to solve the above problems, the first aspect of the present invention provides a method for preparing a polyester reinforced unsaturated polyester resin carriage flat plate, comprising:

[0027] (1) mixing a gel coat resin and a curing agent A, coating the mixture evenly on a polyester film, and curing the mixture to form a gel coat layer;

[0028] (2) uniformly mixing the unsaturated polyester resin, the curing agent B and the coupling agent to form a modified unsaturated polyester resin mixed solution, and then coating the mixed solution on the gel coat layer;

[0029] (3) laying a polyester fiber cloth on the gel coat layer coated with the modified unsaturated polyester resin mixed solution, so that the modified unsaturated polyester resin mixed solution completely infiltrates the polyester fiber cloth to form an uncured reinforcement layer;

[0030] (4) Cover the uncured reinforcing layer with a polyester film, exhaust the air, and then cure to obtain the product.

[0031] In the present invention, a coupling agent is first added to an unsaturated polyester resin for treatment to obtain a modified unsaturated polyester resin, and then polyester fiber cloth is added and immersed in the modified unsaturated polyester resin. The unsaturated polyester resin is used as the main resin and the structural layer material, and the low density and excellent mechanical properties of the polyester fiber cloth are utilized to reinforce the unsaturated polyester resin, so that the obtained carriage flat panel has the characteristics of light weight and high strength, and the toughness effect on the carriage flat panel is better than that of glass fiber, and better cushioning can be provided when facing impact, and it is not easy to be damaged.

[0032] In step (1)

[0033] Preferably, the gel coat resin in the product mainly provides surface protection and decoration. In the carriage flatbed, the gel coat resin can be selected from a gel coat resin with excellent weather resistance, thereby improving the weather resistance of the carriage flatbed and ensuring that the inherent performance and appearance can be maintained even in the sun and rain during transportation. Specifically, it can be a conventional gel coat resin with excellent weather resistance in the art.

[0034] Furthermore, the amount of the gel coat resin used is related to the area of ​​the substrate and has nothing to do with its own thickness. The amount of the gel coat used is 0.35-0.45 kg / m 2 Of course, coating the polyester film with a gel coat resin to form a gel coat layer is not a necessary operation, and the unsaturated polyester resin can also be directly coated on the polyester film to omit the setting of the gel coat layer. In the coating process of the present invention, the gel coat resin can be evenly coated on the polyester film by scraping.

[0035] Preferably, the polyester film plays a role in bearing and transmitting the gel coat resin, and also provides a protective film to prevent dust and scratches, which can be removed or retained during use.

[0036] Furthermore, the polyester film is preferably a BOPET film. The amount of the BOPET film used is related to the area of ​​the substrate and has nothing to do with its own thickness. The amount of the BOPET film used is 0.05 to 0.08 kg / m 2 In some specific embodiments, the thickness of the BOPET film is 0.025 to 0.036 mm.

[0037] In step (2)

[0038] The unsaturated polyester resin in the present invention refers to a polymer compound containing unsaturated double bonds generated by polycondensation of dibasic acid and / or dibasic acid anhydride with diol. The unsaturated polyester resin as a main resin and structural layer material provides good mechanical properties for the car body flat panel, and the unsaturated polyester resin can be a vinyl resin or other unsaturated polyester resins.

[0039] Furthermore, the unsaturated polyester resin has a tensile strength of 50 to 90 MPa and an impact strength of 8 to 12 KJ / m 2 .

[0040] Furthermore, the added mass of the unsaturated polyester resin per mm thickness is 0.7-1.2 kg / m 2 , exemplarily 0.7 kg / m 2 , 0.8kg / m 2 , 0.9kg / m 2 , 1.0kg / m2 , 1.1kg / m 2 , 1.2kg / m 2 , but not limited thereto. More preferably, the added mass of the unsaturated polyester resin per mm thickness is 0.9-1.1 kg / m 2 By controlling the amount of unsaturated polyester resin added, its fiber content can be controlled, and then the mechanical strength of the cured unsaturated polyester resin layer can be regulated.

[0041] Preferably, the added mass of the curing agent B is 0.7-3% of the added mass of the unsaturated polyester resin, specifically 0.7%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, but not limited thereto. If the content of curing agent B is too little, the unsaturated polyester resin cannot be completely cured. If the content of curing agent B is too much, the exothermic peak of the unsaturated polyester resin will increase, which will not only increase the shrinkage rate of the car flat panel, easily causing appearance problems such as ribs and wrinkles on the car flat panel, but also cause the contact area between the unsaturated polyester resin and the polyester fiber cloth to decrease, thereby weakening its reinforcement effect. More preferably, the added mass of the curing agent B per mm thickness is 0.008-0.02 kg / m 2 .

[0042] Furthermore, the curing agent B includes methyl ethyl ketone peroxide to complete the cross-linking and curing reaction of the unsaturated polyester resin. The curing agent A and the curing agent B can be the same curing agent.

[0043] Preferably, the coupling agent is an organosilicon coupling agent, which can react with the active groups in the unsaturated polyester and the polyester fiber cloth to reduce the interfacial tension between the unsaturated polyester and the polyester fiber cloth, so that the two can be better combined and the mechanical strength of the unsaturated polyester layer can be improved. Examples of the organosilicon coupling agent include 3-aminopropyltrimethoxysilane, 3-(methacryloyloxy)propyltrimethoxysilane, vinyltrimethoxysilane, polyethylene glycol trimethoxysilyl propyl ether, aminopropylmethyldiethoxysilane, and the like.

[0044] Furthermore, the coupling agent is 3-aminopropyl trimethoxysilane and polyethylene glycol trimethoxysilyl propyl ether, and the short chain structure and the long chain structure are synergistically compounded. The active groups amino and silanol groups can react with the carbonyl group, double bond and other groups in the unsaturated polyester to enhance the interfacial bonding strength between the unsaturated polyester resin and the polyester fiber cloth. After being added to the polyester fiber cloth, it can react with the active groups on the polyester fiber cloth to increase the interfacial bonding. In addition, polyethylene glycol trimethoxysilyl propyl ether has a lower surface tension, which can improve the compatibility of the system and promote the wettability and spreadability of the polyester fiber cloth in the unsaturated polyester resin. At the same time, due to the presence of the polyethylene glycol flexible chain segment, the flexibility, impact resistance, water resistance and chemical corrosion resistance of the carriage flat plate are improved. The mass ratio of the 3-aminopropyl trimethoxysilane and polyethylene glycol trimethoxysilyl propyl ether is 1: (0.7-1.5).

[0045] Furthermore, the added mass of the coupling agent is 0.5-1% of the added mass of the unsaturated polyester resin, and exemplary amounts are 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, and 1%, but not limited thereto.

[0046] Preferably, the modified unsaturated polyester resin mixed liquid further comprises color paste, the added mass of the color paste is 1-3% of the added mass of the unsaturated polyester resin, and the addition of the color paste will not affect the performance of the carriage flatbed.

[0047] In some specific and preferred embodiments, the modified unsaturated polyester resin mixture also includes 0 to 0.22 kg / m 2 The filler is used to further improve the mechanical properties, flame retardancy, thermal stability, etc. of the carriage flat panel. The 3-aminopropyl trimethoxysilane and polyethylene glycol trimethoxysilyl propyl ether in the system can promote its dispersibility and binding force in the system, making it less likely to agglomerate. Furthermore, the filler includes aluminum hydroxide. If the filler content is too much, the unsaturated polyester resin will be completely infiltrated, affecting the flatness of the polyester fiber cloth, thereby affecting the mechanical properties of the cloth-based gel coat flat panel.

[0048] In the coating process of the present invention, the modified unsaturated polyester resin mixed liquid can be evenly coated on the gel coat layer by scraping.

[0049] In step (3)

[0050] The polyester fiber cloth is a fiber cloth made of polyethylene terephthalate (PET), a fiber-forming polymer obtained by esterification or ester exchange and polycondensation reaction of dimethyl terephthalate (DMT) and ethylene glycol (EG), and is made by spinning and post-treatment. Preferably, the polyester is a crystalline saturated polyester with a melting point of 220-230°C, a flow temperature of 240-245°C, a glass transition temperature of 78-83°C, a heat deformation temperature of 95-100°C (1.8-1.85MPa), and a decomposition temperature of 350-355°C. The relative density of the polyester fiber cloth is 1.3-1.4g / cm 3 It has excellent mechanical properties, high rigidity, water absorption of 0.3-0.6%, good dimensional stability, and the elongation at break of the polyester fiber cloth is 40-50%, good toughness, excellent impact resistance, friction resistance, creep resistance, and good chemical resistance, and the operating temperature is -100-120°C.

[0051] Furthermore, the added mass of the polyester fiber cloth per mm thickness is 0.2 to 0.65 kg / m 2 . More preferably, the added mass of the polyester fiber cloth per mm thickness is 15-35% of the added mass of the unsaturated polyester resin, and it has good wettability in the unsaturated resin and strong interface bonding force, and has a good performance enhancement effect on the unsaturated polyester resin. In some specific and preferred embodiments, the added mass of the polyester fiber cloth per mm thickness is 0.27-0.63 kg / m 2 .

[0052] In step (4)

[0053] Preferably, curing is performed by heating, wherein the heating temperature is 70-90° C., and curing can be performed in an oven.

[0054] Preferably, steel rollers and sponge rollers are used to squeeze out the air, and the polyester film is flattened during heating and curing. Specifically, the air is exhausted and then put into an oven for heating and curing. Tension wheels can be used on both sides of the oven to flatten the materials, including the polyester film and the polyester fiber cloth soaked in the unsaturated polyester fiber, to ensure the smoothness of the appearance of the resulting composite material.

[0055] Furthermore, the polyester film plays a protective role against dust and scratches, and can be removed or retained during use. The polyester film is preferably a BOPET film, and the amount of the BOPET film used is 0.05 to 0.08 kg / m 2 .

[0056] Correspondingly, the present invention also provides a polyester reinforced unsaturated polyester resin carriage flat panel, which is prepared according to the preparation method.

[0057] In the present invention, after being made into a polyester unsaturated resin flat plate, the density is 1.2-1.3 g / cm according to the different polyester fiber contents. 3 , tensile strength reaches 70~140MPa, flexural strength reaches 90~150MPa, impact strength reaches 40~70KJ / m 2 .

[0058] The present invention will be further described below with specific embodiments:

[0059] Example 1

[0060] This embodiment provides a polyester reinforced unsaturated polyester resin carriage flat plate, and the preparation method thereof is as follows:

[0061] (1) Select a weather-resistant gel coat resin, add methyl ethyl ketone peroxide and stir evenly, apply it on the BOPET polyester film by knife coating, and then put it into an oven for curing to form a gel coat layer;

[0062] The added mass of BOPET film is 0.156kg / m 2 The dosage of gel coat resin is 1.05kg / m 2 .

[0063] (2) Add methyl ethyl ketone peroxide, coupling agent and color paste to the vinyl resin and stir evenly to form a modified unsaturated polyester resin mixed liquid. After the gel coat layer is cured, the modified unsaturated polyester resin mixed liquid is applied to the gel coat layer by blade coating according to the thickness requirement of the final flat plate.

[0064] The thickness of the final carriage flat plate is 2.6mm, and the vinyl resin (model EL-4305 of Jiangsu Lidel, with a tensile strength of 68MPa and an impact strength of 11KJ / m 2 ) is used in an amount of 2.4 kg / m 2 ; The dosage of methyl ethyl ketone peroxide is 0.024kg / m 2 ; The coupling agent is 3-aminopropyltrimethoxysilane (KH540), and the dosage is 0.017kg / m 2 ; The added mass of color paste is 2% of the vinyl resin.

[0065] (3) laying a polyester fiber cloth on the gel coat layer coated with the modified unsaturated polyester resin mixed solution, so that the modified unsaturated polyester resin mixed solution completely infiltrates the polyester fiber cloth to form an uncured reinforcement layer;

[0066] (4) Cover the uncured reinforcement layer with a layer of BOPET polyester film, squeeze out the air inside with a steel roller and a sponge roller, and then put it into an oven for heating and curing. Use tension wheels on both sides of the oven to flatten the BOPET film, unsaturated polyester resin, polyester fiber cloth, etc. to obtain the product.

[0067] The density of polyester fiber cloth is 1.3~1.4g / cm 3 , water absorption is 0.4% to 0.5%, elongation at break is 40% to 50%, dosage is 0.885kg / m 2 ;The thickness of BOPET film is 0.036mm.

[0068] Example 2

[0069] This embodiment provides a polyester reinforced unsaturated polyester resin carriage flat plate, which is basically the same as the embodiment 1, except that:

[0070] The final thickness of the carriage flatbed is 2.7 mm, and the amount of vinyl resin (model EL-4305) used is 2.2 kg / m 2 ;

[0071] The dosage of polyester fiber cloth is 1.062kg / m 2 .

[0072] Example 3

[0073] This embodiment provides a polyester reinforced unsaturated polyester resin carriage flat plate, which is basically the same as the embodiment 1, except that:

[0074] The final thickness of the carriage flatbed is 2 mm, and the amount of vinyl resin (model EL-4305) used is 1.5 kg / m 2 ;

[0075] The dosage of polyester fiber cloth is 1.240kg / m 2 .

[0076] Example 4

[0077] This embodiment provides a polyester reinforced unsaturated polyester resin carriage flat plate, which is basically the same as Embodiment 2, except that:

[0078] The final thickness of the carriage flat plate is 2.7mm, the unsaturated resin (model is Huizhou Xinshuangli's 193P, tensile strength is 63MPa, impact strength is 9.1KJ / m 2 ) is used in an amount of 2.5 kg / m 2 .

[0079] Example 5

[0080] This embodiment provides a polyester reinforced unsaturated polyester resin carriage flat plate, which is basically the same as Embodiment 4, except that:

[0081] The coupling agent is a mixture of 3-aminopropyl trimethoxysilane (KH540) and polyethylene glycol trimethoxysilane propyl ether (silane coupling agent 4140) in a mass ratio of 1:1.

[0082] Comparative Example 1

[0083] This comparative example provides a carriage flat plate, and its preparation method is as follows:

[0084] (1) Select a weather-resistant gel coat resin, add methyl ethyl ketone peroxide and stir evenly, apply it on the BOPET polyester film by knife coating, and then put it into an oven for curing to form a gel coat layer;

[0085] The added mass of BOPET film is 0.156kg / m 2 The dosage of gel coat resin is 1.05kg / m 2 .

[0086] (2) Add methyl ethyl ketone peroxide and color paste to the vinyl resin and stir evenly to form an unsaturated polyester resin mixed liquid. After the gel coat layer is cured, the unsaturated polyester resin mixed liquid is applied to the gel coat layer by blade coating according to the thickness requirements of the final flat plate.

[0087] The final thickness of the carriage flatbed is 2.6 mm, and the amount of vinyl resin (model EL-4305) is 2.4 kg / m 2 ; The dosage of methyl ethyl ketone peroxide is 0.024kg / m 2 ; The added mass of color paste is 2% of vinyl resin;

[0088] (3) A layer of BOPET polyester film is covered on the gel coat layer coated with the unsaturated polyester resin mixture, and the air inside is squeezed out with a steel roller and a sponge roller. Then, the film is placed in an oven for heating and curing. Tension wheels are used on both sides of the oven to flatten the BOPET film, the unsaturated polyester resin, etc., to obtain the product.

[0089] The thickness of the BOPET film is 0.03 mm, and the mass of the color paste added is 2% of the vinyl resin.

[0090] Comparative Example 2

[0091] This comparative example provides a carriage flatbed, which is basically the same as comparative example 1, except that:

[0092] Unsaturated resin (type 193P) was used instead of vinyl resin.

[0093] The raw materials and dosages of some of the preparation methods of the carriage flat panels obtained in the examples and comparative examples are specifically shown in Table 1.

[0094] Table 1 Part of the raw materials and dosages for preparing the carriage flat panels obtained in the examples and comparative examples

[0095]

[0096]

[0097] Performance Testing

[0098] The density, tensile strength, bending strength and impact strength of the carriage flat panels obtained in the embodiments and comparative examples were tested, and the test structure is shown in Table 2 below.

[0099] Table 2 Test results of the carriage flatbed obtained in the embodiments and comparative examples

[0100]

[0101] From the above results, it can be seen that the unsaturated polyester resin is reinforced with polyester fiber cloth to obtain a polyester fiber cloth-added unsaturated resin gel coat material, which is used in box panels of refrigerated compartments, dry truck compartments, RVs, etc., and has the characteristics of light weight and high strength. The toughness of organic polyester fiber is better than that of glass fiber, and it has better buffering when facing impact and is not easy to be damaged. Its impact resistance can reach more than 40MPa. Among them, compared with the unsaturated resin of model 193P, the vinyl resin of model EL-4305 has higher strength and belongs to a high-strength unsaturated resin. The obtained polyester reinforced unsaturated polyester resin compartment flat panel has better comprehensive mechanical properties and density.

[0102] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for preparing a polyester reinforced unsaturated polyester resin carriage flat plate, characterized in that: include: (1) mixing a gel coat resin and a curing agent A, coating the mixture evenly on a polyester film, and curing the mixture to form a gel coat layer; (2) uniformly mixing the unsaturated polyester resin, the curing agent B and the coupling agent to form a modified unsaturated polyester resin mixed solution, and then coating the mixed solution on the gel coat layer; (3) laying a polyester fiber cloth on the gel coat layer coated with the modified unsaturated polyester resin mixed solution, so that the modified unsaturated polyester resin mixed solution completely infiltrates the polyester fiber cloth to form an uncured reinforcement layer; (4) Cover the uncured reinforcing layer with a polyester film, exhaust the air, and then cure to obtain the product.

2. The method for preparing the polyester reinforced unsaturated polyester resin carriage flat plate according to claim 1, characterized in that: The density of the polyester reinforced unsaturated polyester resin carriage flat plate is 1.2-1.3 g / cm 3 .

3. The method for preparing the polyester reinforced unsaturated polyester resin carriage flat plate according to claim 1, characterized in that: The added mass of the unsaturated polyester resin per mm thickness is 0.7-1.1 kg / m 2 The added mass of the coupling agent is 0.5-1% of the added mass of the unsaturated polyester resin; The coupling agent is an organic silicon coupling agent.

4. The method for preparing the polyester reinforced unsaturated polyester resin carriage flat plate according to claim 1, characterized in that: The coupling agent is 3-aminopropyl trimethoxysilane and polyethylene glycol trimethoxysilyl propyl ether, and the addition mass ratio of the 3-aminopropyl trimethoxysilane and the polyethylene glycol trimethoxysilyl propyl ether is 1: (0.7-1.5).

5. The method for preparing the polyester reinforced unsaturated polyester resin carriage flat plate according to claim 1, characterized in that: The added mass of the polyester fiber cloth per mm thickness is 0.2-0.65 kg / m 2 .

6. The method for preparing the polyester reinforced unsaturated polyester resin carriage flat plate according to claim 5, characterized in that: The added mass of the polyester fiber cloth per mm thickness is 15-35% of the added mass of the unsaturated polyester resin.

7. The method for preparing the polyester reinforced unsaturated polyester resin carriage flat plate according to claim 1 or 5, characterized in that: The water absorption rate of the polyester fiber cloth is 0.3-0.6%, and the relative density of the polyester fiber cloth is 1.3-1.4 g / cm 3 ; The breaking elongation of the polyester fiber cloth is 40-50%.

8. The method for preparing the polyester reinforced unsaturated polyester resin carriage flat plate according to claim 1, characterized in that: The added mass of the curing agent B is 0.7-3% of the added mass of the unsaturated polyester resin; the curing agent includes methyl ethyl ketone peroxide.

9. The method for preparing the polyester reinforced unsaturated polyester resin carriage flat plate according to claim 1, characterized in that: In step (4), curing is performed by heating, wherein the heating temperature is 70 to 90°C.

10. A polyester reinforced unsaturated polyester resin carriage flat plate, characterized in that: The invention is prepared according to the method for preparing the polyester reinforced unsaturated polyester resin carriage flat plate according to any one of claims 1 to 9.

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