Flame-retardant glass fiber reinforced plastic plate and preparation method thereof

Abstract

The invention relates to the technical field of high polymer material preparation, and discloses a flame-retardant glass fiber reinforced plastic plate and a preparation method thereof.The flame-retardant glass fiber reinforced plastic plate is prepared from, by weight, 100 parts of unsaturated polyester resin, 51-65 parts of glass fiber, 30-40 parts of flame retardant and 1-1.5 parts of curing agent; wherein the temperature corresponding to the exothermic peak of the unsaturated polyester resin is higher than 190 DEG C; the flame retardant comprises an organophosphate flame retardant. By implementing the preparation method, the reaction activity of the glass fiber reinforced plastic plate is improved, so that the obtained flame-retardant glass fiber reinforced plastic plate is good in flame retardance, and meanwhile, the Barcol hardness, the tensile strength and the bending strength are obviously improved, the conventional requirements of the glass fiber reinforced plastic plate can be met, and the stable performance of the flame-retardant glass fiber reinforced plastic plate is maintained.

Description

Technical Field

[0001] The invention relates to the technical field of polymer material preparation, and in particular to a flame retardant glass fiber reinforced plastic plate and a preparation method thereof. Background Art

[0002] FRP refers to glass fiber reinforced plastic, which generally refers to a composite material that uses glass fiber and its glass cloth, glass tape, glass felt, glass yarn and other products as reinforcing materials, and unsaturated polyester, epoxy resin, phenolic resin and other synthetic resins as the matrix. FRP has the advantages of light weight, high strength, corrosion resistance, good electrical properties, good thermal properties, and good designability, and is widely used in many fields such as construction, chemical industry, and transportation industry.

[0003] With the development of society, more and more fields require FRP to have a certain flame retardant effect. At present, there are three main types of flame retardant formulas for flame retardant FRP plates: the first is a formula with halogen and antimony trioxide as the main flame retardant, which is characterized by a small amount of addition and high flame retardant efficiency, but the cost is high, and halogens will produce toxic smoke when burned, which will cause huge personal injuries in actual fires and is prohibited from use in many occasions; the second is a halogen-free flame retardant formula with aluminum hydroxide or magnesium hydroxide as the main flame retardant, which is characterized by low smoke and slow burning speed, but low flame retardant efficiency, and requires a very high addition amount, which increases the viscosity of the formula, affects the impregnation of glass fiber and ultimately affects the scope of application; the third is a formula based on organic phosphate and phosphorus nitrogen flame retardants, which is characterized by low cost, good synergistic flame retardant effect, and low toxicity, but it will affect the mechanical properties and Bacol hardness of the plate, making the hardness of the FRP plate softer. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a flame retardant glass fiber reinforced plastic plate and a preparation method thereof, so that the flame retardant glass fiber reinforced plastic plate has good flame retardant effect, low cost and low toxicity, while taking into account its hardness and mechanical properties, and maintaining the stable performance of the flame retardant glass fiber reinforced plastic plate.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a flame retardant glass fiber reinforced plastic plate, wherein the raw materials for preparing the flame retardant glass fiber reinforced plastic plate include, by weight: 100 parts of unsaturated polyester resin, 51-65 parts of glass fiber, 30-40 parts of flame retardant, and 1-1.5 parts of curing agent;

[0006] Wherein, the temperature corresponding to the exothermic peak of the unsaturated polyester resin is greater than 190°C;

[0007] The flame retardant includes an organic phosphate flame retardant.

[0008] As an improvement of the above scheme, the raw materials for preparing the unsaturated polyester resin include: 18-18.5% of saturated acid anhydride, 22-22.5% of fumaric anhydride, 28-29.5% of polyol, 30.5-31% of vinyl crosslinking monomer, 0.0075-0.008% of inhibitor, 0.021-0.0235% of accelerator and the balance of functional additives.

[0009] As an improvement of the above solution, the flame retardant further includes a phosphorus-nitrogen flame retardant;

[0010] The phosphorus-nitrogen flame retardant is a modified phosphorus-nitrogen flame retardant coated with a modifier, wherein the modifier is one or more of melamine cyanurate, epoxy resin, silane, and formaldehyde resin.

[0011] As an improvement of the above solution, the weight ratio of the organic phosphate flame retardant to the phosphorus nitrogen flame retardant is 1:(0.9-1.4).

[0012] As an improvement of the above scheme, the organic phosphate flame retardant is selected from one or more of tris(2-carboxyethyl)phosphine, tris(2-chloropropyl) phosphate, tris(1,3-dichloropropyl) phosphate, and tricresyl phosphate.

[0013] As an improvement of the above scheme, the phosphorus-nitrogen flame retardant is one or more of ammonium polyphosphate, aluminum hypophosphite, diammonium hydrogen phosphate, melamine, urea, ammonium sulfate, melamine phosphate, and melamine pyrophosphate.

[0014] As an improvement of the above solution, the added weight of the glass fiber is 38% to 48% of the total weight of the unsaturated polyester resin and the flame retardant.

[0015] As an improvement of the above solution, the glass fiber is a glass fiber mat with an alkali-free alkali metal oxide content of less than 0.8%, and the content of glass fiber in the glass fiber mat is 96% to 99%.

[0016] As an improvement of the above solution, the curing agent is selected from one or more of methyl ethyl ketone peroxide, cyclohexanone peroxide, benzoyl peroxide, and tert-butyl peroxide.

[0017] The second aspect of the present invention also provides a method for preparing the flame-retardant glass fiber reinforced plastic plate, comprising:

[0018] (1) mixing unsaturated polyester resin and flame retardant to obtain a first mixed material for standby use;

[0019] (2) uniformly mixing the first mixed material and the curing agent in proportion to form a second mixed material, and then coating the second mixed material on a polyester film;

[0020] (3) laying glass fibers on the film coated with the second mixture, so that the second mixture completely impregnates the glass fibers to form an uncured flame-retardant glass fiber reinforced plastic sheet;

[0021] (4) Cover the uncured flame-retardant fiberglass plate with a polyester film, use two rollers to expel air, and then cure it.

[0022] The implementation of the present invention has the following beneficial effects:

[0023] The present invention reduces the influence of adding a flame retardant in the flame retardant glass fiber reinforced plastic plate on the reduction of the hardness of the glass fiber reinforced plastic plate, adopts an unsaturated polyester resin whose temperature corresponding to the exothermic peak of the unsaturated polyester resin is greater than 190° C. to prepare the glass fiber reinforced plastic plate, thereby improving the reaction activity of the glass fiber reinforced plastic plate, so that the flame retardant property of the obtained flame retardant glass fiber reinforced plastic plate is good, and at the same time, the Barcol hardness and mechanical strength can meet the conventional requirements of the glass fiber reinforced plastic plate, and the performance of the flame retardant glass fiber reinforced plastic plate is maintained stable.

[0024] The flame retardant selected in the present invention has high flame retardant efficiency and low cost, and can be industrialized for production. Moreover, the flame retardant does not generate toxic gas when burned, and can be widely used in various fields. 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] Selecting a formula mainly composed of organic phosphate and phosphorus-nitrogen flame retardants and unsaturated resins to prepare flame-retardant FRP plates will cause the hardness of the FRP plates to be soft, affecting their further use. The main reasons are: liquid organic phosphate flame retardants do not participate in the curing reaction of the resin and cannot be polymerized into large molecules. Liquid organic phosphate flame retardants are free in the FRP plates. The free small organic molecules will act as toughening agents and consume free radicals during the curing process, thereby delaying the progress of the curing reaction and reducing the mechanical strength and Bacol hardness of the FRP plates.

[0027] In order to solve the above problems, the first aspect of the present invention provides a flame retardant glass fiber reinforced plastic plate, wherein the raw materials for its preparation include, by weight: 100 parts of unsaturated polyester resin, 51-65 parts of glass fiber, 30-40 parts of flame retardant, and 1-1.5 parts of curing agent;

[0028] Wherein, the temperature corresponding to the exothermic peak of the unsaturated polyester resin is greater than 190°C;

[0029] The flame retardant includes an organic phosphate flame retardant.

[0030] Organic phosphate flame retardants have good flame retardant effects and low toxicity, but their addition will reduce the strength and hardness of the resin. In the present invention, by selecting an unsaturated polyester resin with a temperature corresponding to an exothermic peak greater than 190° C. as the matrix of the flame-retardant glass fiber reinforced plastic plate, the reaction activity and strength of the unsaturated polyester resin are improved, thereby improving the mechanical strength of the flame-retardant glass fiber reinforced plastic plate obtained after the unsaturated polyester resin and the flame retardant are mixed, and the amount of active content reduction caused by the addition of the flame retardant can be compensated, thereby offsetting the performance reduction caused by the flame retardant and maintaining the stable performance of the flame-retardant glass fiber reinforced plastic plate.

[0031] Furthermore, the organic phosphate flame retardant is selected from one or more of tris(2-carboxyethyl)phosphine (TCEP), tris(2-chloropropyl) phosphate (TCPP), tris(1,3-dichloropropyl) phosphate (TDCPP), and tricresyl phosphate (TPP).

[0032] The activity of the selected unsaturated polyester resin is higher than that of the conventional unsaturated polyester resin, which will lead to too fast curing rate of the glass fiber reinforced plastic, and then generate higher local thermal stress in the glass fiber reinforced plastic, affecting the yield of the glass fiber reinforced plastic plate. The raw materials for preparing the unsaturated polyester resin in the present invention include: 18-18.5% of saturated acid anhydride, 22-22.5% of fumaric anhydride, 28-29.5% of polyol, 30.5-31% of vinyl crosslinking monomer, 0.0075-0.008% of inhibitor, 0.021-0.0235% of accelerator and the balance of functional additives. In the present invention, fumaric anhydride is added to the raw materials for preparation, which has high activity and low initial reaction temperature. It cooperates with monomers containing unsaturated double bonds, etc., and can react and start gelation at a low temperature, so that the exothermic peak of the obtained unsaturated polyester resin is 15-20°C higher than that of conventional unsaturated polyester resin, which can accelerate the speed of the unsaturated polyester resin curing process to compensate for the curing delay side effect brought by the organic phosphate flame retardant.

[0033] Furthermore, the saturated acid anhydride includes phthalic anhydride, which functions to undergo an esterification reaction with the polyol without providing an active ingredient of unsaturated double bonds.

[0034] Furthermore, the polyol is a C4-C10 long-chain polyol and / or a C2-C3 short-chain polyol.

[0035] Furthermore, the vinyl cross-linking monomer includes but is not limited to styrene, vinyl toluene, α-methylstyrene and diallyl phthalate.

[0036] Furthermore, the polymerization inhibitor includes hydroquinone, methyl hydroquinone, 2,6-di-tert-butyl-p-cresol, and p-hydroxyanisole.

[0037] Furthermore, the promoter includes but is not limited to copper cyclohexaneate and cobalt isooctanoate.

[0038] Furthermore, the functional additive includes an antioxidant, and the antioxidant is a conventional antioxidant used in the art, and examples thereof include 2,6-p-tert-butylxylenol, triphenyl phosphite, 2,5-di-tert-butylhydroquinone, hypophosphorous acid, and the like.

[0039] Preferably, the flame retardant further comprises a phosphorus nitrogen flame retardant, and the phosphorus nitrogen flame retardant is a modified phosphorus nitrogen flame retardant coated with a modifier. The phosphorus nitrogen flame retardant after the coating can avoid the reaction between the phosphorus nitrogen flame retardant and the unsaturated resin, reduce the activity requirements in the unsaturated polyester resin, and can also protect the flame retardant from being destroyed when used in outdoor, humid and other environments. The modifier has a coating effect on the phosphorus nitrogen flame retardant, and is further preferably one or more of melamine cyanurate (MCA), epoxy resin, silane, and formaldehyde resin, which can achieve a good coating effect on the phosphorus nitrogen flame retardant. On the basis of not affecting its flame retardant performance, the flame retardant migration phenomenon caused by the easy moisture absorption of the phosphorus nitrogen flame retardant can be improved, and at the same time, the flame retardant is effectively promoted. The uniform dispersion of the flame retardant in the glass fiber reinforced plastic system, thereby improving the curing efficiency of the unsaturated polyester resin, and avoiding the deterioration of mechanical tensile strength and hardness and other properties caused by the curing degree of the local unsaturated resin.

[0040] Furthermore, the phosphorus-nitrogen flame retardant has an average particle size of 10 μm to 30 μm, a phosphorus content (%) of 25 to 35%, and a nitrogen content (%) of 10 to 20%.

[0041] The main process of coating the phosphorus-nitrogen flame retardant with the modifier can be: dispersing the phosphorus-nitrogen flame retardant in water or alcohol solution to form a suspension, then adding the modifier to the suspension for coating reaction, and finally filtering, washing, and drying the coating reaction product, wherein the weight ratio of the modifier to the phosphorus-nitrogen flame retardant can be 1: (0.3-4), and the reaction temperature, reaction time, pH of the reaction system and other conditions during the coating reaction can be reasonably adjusted according to the specific selected modifiers and the conditions of the conventional coating reaction. Alternatively, the modified phosphorus-nitrogen flame retardant coated with the modifier can also be directly used as a commercial product, which can be listed as Zhenjiang Xingxing Flame Retardant Co., Ltd. APP-EX, Qingyuan Presaifu EPFR-APP262, EPFR-APP241, EPFR-APP216G, etc.

[0042] Furthermore, the weight ratio of the organic phosphate flame retardant to the phosphorus nitrogen flame retardant is 1:(0.9-1.4). Through the synergistic effect of the phosphorus nitrogen flame retardant and the organic phosphate flame retardant, the flame retardant effect is good, the fire resistance of the glass fiber reinforced plastic plate is significantly improved, and the mechanical strength of the glass fiber reinforced plastic plate is improved. The weight ratio of the organic phosphate flame retardant to the phosphorus nitrogen flame retardant is 1:0.9, 1:0.95, 1:1, 1:1.05, 1:1.1, 1:1.15, 1:1.2, 1:1.25, 1:1.3, 1:1.35, 1:1.4, but is not limited to this.

[0043] Furthermore, the phosphorus-nitrogen flame retardant is one or more of ammonium polyphosphate (APP), aluminum hypophosphite, diammonium hydrogen phosphate, melamine, urea, ammonium sulfate, melamine phosphate, and melamine pyrophosphate.

[0044] The activity of the unsaturated polyester resin selected in the present invention is higher than that of the conventional unsaturated polyester resin. Direct use may make it impossible for the glass fibers to be sufficiently impregnated with the unsaturated polyester resin. Moreover, rapid curing will produce a large shrinkage rate, resulting in internal stress or cracks in the material during curing and molding, thereby affecting the overall performance of the glass fiber reinforced plastic plate. In the present invention, the weight of the glass fiber added is controlled to be 38% to 48% of the total weight of the unsaturated polyester resin and the flame retardant. In the system where the flame retardant is evenly dispersed, the mechanical properties of the obtained glass fiber reinforced plastic plate are guaranteed to meet the requirements, and the glass fiber can be fully impregnated with the unsaturated polyester resin. The glass fiber is an alkali-free (alkali metal oxide content is less than 0.8%) glass fiber mat. The content of the glass fiber in the glass fiber mat is 96% to 99%, and the bonding performance with the unsaturated polyester resin is good, which promotes the compatibility of the glass fiber and the unsaturated polyester resin, further promotes the strength of the glass fiber reinforced plastic, and effectively reduces the shrinkage and curling phenomenon when the glass fiber reinforced plastic is cured. The added weight of the glass fiber can be 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48% of the total weight of the unsaturated polyester resin and the flame retardant, but not limited thereto. The content of the glass fiber in the glass fiber mat is 96%, 96.5%, 97%, 97.5%, 98%, but not limited thereto.

[0045] Preferably, the curing agent is selected from one or more of methyl ethyl ketone peroxide, cyclohexanone peroxide, benzoyl peroxide, and tert-butyl peroxide.

[0046] Accordingly, the present invention also provides a method for preparing the flame-retardant glass fiber reinforced plastic plate, comprising:

[0047] (1) mixing unsaturated polyester resin and flame retardant to obtain a first mixed material for standby use;

[0048] (2) uniformly mixing the first mixed material and the curing agent in proportion to form a second mixed material, and then coating the second mixed material on a polyester film;

[0049] (3) laying glass fibers on the film coated with the second mixture, so that the second mixture completely impregnates the glass fibers to form an uncured flame-retardant glass fiber reinforced plastic sheet;

[0050] (4) Cover the uncured flame-retardant fiberglass plate with a polyester film, use two rollers to expel air, and then cure it.

[0051] Preferably, in step (2), a pump may be used to mix the first mixture and the curing agent in proportion to form the second mixture. Specifically, the first mixture and the curing agent may be pumped into a mixing tank in proportion and stirred evenly under the action of a pump.

[0052] Furthermore, the specific operation of coating the second mixed material on the polyester film is: let the stirred second mixed material flow to the material trough, use the scraper of the material trough to scrape it onto the polyester film, and use the scraper of the material trough to scrape the second mixed material flat according to the required width and thickness, and transmit it forward with the film. In this process, the unsaturated polyester resin is a flowing liquid material, so the polyester film is both a protective film and a conveyor belt, providing support and transmission for the shape and thickness of the unsaturated polyester resin, and realizing the assembly line production of the glass fiber reinforced plastic plate. The polyester film is preferably a BOPET film, and there is no specific requirement for its dosage.

[0053] Preferably, in step (4), a steel roller and a sponge roller are used to squeeze out the air, and the polyester film is flattened during the heating and curing process to ensure the smoothness of the appearance of the obtained composite material. 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 there is no specific requirement for its amount.

[0054] Furthermore, curing is performed by heating, which can be performed in an oven. The curing temperature is 75-80°C.

[0055] Preferably, the preparation method further comprises post-processing, specifically comprising: after the curing is completed, cutting and packaging the obtained flame-retardant fiberglass sheet.

[0056] The present invention will be further described below with specific embodiments:

[0057] Example 1

[0058] The present embodiment provides a flame-retardant glass fiber reinforced plastic plate, wherein the raw materials for preparing the flame-retardant glass fiber reinforced plastic plate include, by weight: 100 parts of unsaturated polyester resin, 58.1 parts of 98% alkali-free glass fiber felt, 15 parts of tri(2-carboxyethyl)phosphine (TCEP), 20 parts of ammonium polyphosphate (APP-EX model, Zhenjiang Xingxing Flame Retardant Co., Ltd., with a maximum particle size of 16 μm, a phosphorus content (%) of 28%, and a nitrogen content (%) of 14%) after epoxy resin coating, and 1 part of methyl ethyl ketone peroxide;

[0059] The raw materials for preparing the unsaturated polyester resin include: 18.5% of phthalic anhydride, 22% of fumaric anhydride, 21.7% of diethylene glycol, 7.2% of propylene glycol, 0.0075% of hydroquinone, 30.5% of styrene, 0.0035% of copper cyclohexaneate, 0.02% of cobalt isooctanoate, and the remainder of antioxidant, and the temperature corresponding to the exothermic peak is 195°C.

[0060] The preparation method of the flame retardant glass fiber reinforced plastic plate is as follows:

[0061] (1) mixing the unsaturated polyester resin and the flame retardant uniformly and in proportion to obtain a first mixed material for standby use;

[0062] (2) Pumping the first mixed material and the curing agent in proportion to the mixing tank by a pump, stirring evenly to form a second mixed material and flowing it to the material trough, using a scraper of the material trough to scrape it onto the BOPET polyester film, and using the scraper of the material trough to scrape the second mixed material flat according to the required width and thickness, and then transmitting it forward along with the BOPET film;

[0063] (3) laying 98% alkali-free glass fiber felt on the film coated with the second mixture, so that the second mixture completely impregnates the 98% alkali-free glass fiber felt to form an uncured flame-retardant glass fiber reinforced plastic plate;

[0064] (4) Cover the uncured flame-retardant fiberglass plate with 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.

[0065] Example 2

[0066] This embodiment provides a flame retardant glass fiber reinforced plastic plate, which is basically the same as the embodiment 1, except that:

[0067] The raw materials for its preparation include, by weight: 100 parts of unsaturated polyester resin, 51 parts of 98% alkali-free glass fiber felt, 20 parts of tri(2-carboxyethyl)phosphine (TCEP), 15 parts of ammonium polyphosphate coated with epoxy resin (Qingyuan Presaifu EPFR-APP241, with an average particle size of 15 μm, a phosphorus content (%) of 29-31%, and a nitrogen content (%) of 14-15%), and 1.5 parts of methyl ethyl ketone peroxide;

[0068] Example 3

[0069] This embodiment provides a flame retardant glass fiber reinforced plastic plate, which is basically the same as the embodiment 1, except that:

[0070] The raw materials for its preparation include, by weight: 100 parts of unsaturated polyester resin, 65 parts of 98% alkali-free glass fiber felt, 17 parts of tri(2-carboxyethyl)phosphine (TCEP), 18 parts of ammonium polyphosphate coated with epoxy resin (Zhenjiang Xingxing Flame Retardant Co., Ltd., APP-EX model), and 1.2 parts of methyl ethyl ketone peroxide;

[0071] Example 4

[0072] This embodiment provides a flame retardant glass fiber reinforced plastic plate, which is basically the same as the embodiment 1, except that:

[0073] The raw materials for preparing the product include, by weight: 100 parts of unsaturated polyester resin, 58.1 parts of 98% alkali-free glass fiber felt, 15 parts of tri(2-carboxyethyl)phosphine (TCEP), 20 parts of ammonium polyphosphate and 1 part of methyl ethyl ketone peroxide.

[0074] Example 5

[0075] This embodiment provides a flame retardant glass fiber reinforced plastic plate, which is basically the same as the embodiment 1, except that:

[0076] The raw materials for its preparation include, by weight: 100 parts of unsaturated polyester resin, 58.1 parts of 98% glass fiber felt, 15 parts of tri(2-carboxyethyl)phosphine (TCEP), 20 parts of ammonium polyphosphate coated with epoxy resin (Zhenjiang Xingxing Flame Retardant Co., Ltd., APP-EX model), and 1 part of methyl ethyl ketone peroxide.

[0077] Comparative Example 1

[0078] This comparative example provides a flame retardant glass fiber reinforced plastic plate, which is basically the same as Example 1, except that:

[0079] The raw materials for preparing the product include, by weight: 100 parts of unsaturated polyester resin, 58.1 parts of 98% alkali-free glass fiber felt and 1 part of methyl ethyl ketone peroxide.

[0080] Comparative Example 2

[0081] This comparative example provides a flame retardant glass fiber reinforced plastic plate, which is basically the same as Example 1, except that:

[0082] The unsaturated polyester resin is a conventional unsaturated polyester resin (model 191), and the temperature corresponding to the exothermic peak is 175°C.

[0083] Comparative Example 3

[0084] This comparative example provides a flame retardant glass fiber reinforced plastic plate, which is basically the same as comparative example 1, except that:

[0085] The unsaturated polyester resin is a conventional unsaturated polyester resin (model 191), and the temperature corresponding to the exothermic peak is 175°C.

[0086] The raw materials and amounts of some of the preparation of the carriage flat panels obtained in the examples and comparative examples are specifically shown in Table 1.

[0087] Table 1 Part of the raw materials and dosages for preparing the carriage flat panels obtained in the examples and comparative examples

[0088]

[0089]

[0090] Performance Testing

[0091] The tensile strength, bending strength and Barcol hardness of the flame-retardant glass fiber reinforced plastic plates obtained in the examples and comparative examples were tested. The thickness of the flame-retardant glass fiber reinforced plastic plates during the test was 2 mm. The test results are shown in Table 2 below.

[0092] Table 2 Test results of flame retardant glass fiber reinforced plastic plates obtained in the examples and comparative examples

[0093] Tensile strength(MPa) Bending strength(MPa) Barcol hardness (HBa) Example 1 100 143 42 Example 2 98 141 41 Example 3 110 145 44 Example 4 102 141 41 Example 5 99 144 43 Comparative Example 1 103 150 55 Comparative Example 2 85 113 20 Comparative Example 3 100 140 40

[0094] From the above results, it can be seen that the present invention uses an unsaturated polyester resin whose exothermic peak corresponds to a temperature greater than 190°C to prepare a flame-retardant glass fiber reinforced plastic plate, which improves the reaction activity of the glass fiber reinforced plastic plate, so that the flame retardant performance of the obtained flame-retardant glass fiber reinforced plastic plate is good, and at the same time, the Barcol hardness, tensile strength and bending strength are significantly improved, which can meet the conventional requirements of the glass fiber reinforced plastic plate and maintain the stable performance of the flame-retardant glass fiber reinforced plastic plate.

[0095] 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 flame retardant glass fiber reinforced plastic plate, characterized in that: The raw materials for its preparation include, by weight: 100 parts of unsaturated polyester resin, 51-65 parts of glass fiber, 30-40 parts of flame retardant, and 1-1.5 parts of curing agent; Wherein, the temperature corresponding to the exothermic peak of the unsaturated polyester resin is greater than 190°C; The flame retardant includes an organic phosphate flame retardant.

2. The flame retardant glass fiber reinforced plastic sheet according to claim 1, characterized in that: The raw materials for preparing the unsaturated polyester resin include: 18-18.5% of saturated acid anhydride, 22-22.5% of fumaric anhydride, 28-29.5% of polyol, 30.5-31% of vinyl crosslinking monomer, 0.0075-0.008% of polymerization inhibitor, 0.021-0.0235% of accelerator and the balance of functional additives.

3. The flame retardant glass fiber reinforced plastic sheet according to claim 1, characterized in that: The flame retardant also includes a phosphorus-nitrogen flame retardant; The phosphorus-nitrogen flame retardant is a modified phosphorus-nitrogen flame retardant coated with a modifier, wherein the modifier is one or more of melamine cyanurate, epoxy resin, silane, and formaldehyde resin.

4. The flame retardant glass fiber reinforced plastic sheet according to claim 3, characterized in that: The weight ratio of the organic phosphate flame retardant to the phosphorus nitrogen flame retardant is 1:(0.9-1.4).

5. The flame retardant glass fiber reinforced plastic sheet according to claim 3, characterized in that: The organic phosphate flame retardant is selected from one or more of tris(2-carboxyethyl)phosphine, tris(2-chloropropyl) phosphate, tris(1,3-dichloropropyl) phosphate, and tricresyl phosphate.

6. The flame retardant glass fiber reinforced plastic sheet according to claim 3, characterized in that: The phosphorus-nitrogen flame retardant is one or more of ammonium polyphosphate, aluminum hypophosphite, diammonium hydrogen phosphate, melamine, urea, ammonium sulfate, melamine phosphate, and melamine pyrophosphate.

7. The flame retardant glass fiber reinforced plastic sheet according to claim 1, characterized in that: The added weight of the glass fiber is 38% to 48% of the total weight of the unsaturated polyester resin and the flame retardant.

8. The flame retardant glass fiber reinforced plastic sheet according to claim 7, characterized in that: The glass fiber is a glass fiber felt with an alkali-free alkali metal oxide content of less than 0.8%, and the content of the glass fiber in the glass fiber felt is 96% to 99%.

9. The flame retardant glass fiber reinforced plastic sheet according to claim 1, characterized in that: The curing agent is selected from one or more of methyl ethyl ketone peroxide, cyclohexanone peroxide, benzoyl peroxide, and tert-butyl peroxide.

10. The method for preparing a flame retardant glass fiber reinforced plastic sheet according to any one of claims 1 to 9, characterized in that: include: (1) mixing unsaturated polyester resin and flame retardant to obtain a first mixed material for standby use; (2) uniformly mixing the first mixed material and the curing agent in proportion to form a second mixed material, and then coating the second mixed material on a polyester film; (3) laying glass fibers on the film coated with the second mixture, so that the second mixture completely impregnates the glass fibers to form an uncured flame-retardant glass fiber reinforced plastic sheet; (4) Cover the uncured flame-retardant fiberglass plate with a polyester film, use two rollers to expel air, and then cure it.

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