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CN-121975270-A - Glass fiber reinforced epoxy resin plate and preparation method thereof

CN121975270ACN 121975270 ACN121975270 ACN 121975270ACN-121975270-A

Abstract

The invention belongs to the technical field of fiber resin composite materials. The invention provides a glass fiber reinforced epoxy resin plate and a preparation method thereof, the method comprises the steps of S1, starting a gumming machine, putting 39-40 parts of epoxy resin into a gumming groove according to parts by weight, adding 10-13 parts of acetone for dilution, adding 9-10 parts of a curing agent, 1-1.5 parts of an accelerator, 2-2.2 parts of phosphoric acid activated rice hull ash and 3-3.5 parts of modified melamine urate to obtain a composite sizing material, S2, after the temperature of a pretreatment section and a post-baking section of the gumming machine is stable, putting 50-52 parts of glass fiber cloth into the gumming machine and starting the gumming machine to obtain the glass fiber gumming material, and S3, adopting a high-temperature autoclave molding process to treat and cut the glass fiber gumming material to obtain the glass fiber reinforced epoxy resin plate. The invention ensures that the mechanical property (tensile strength) of the glass fiber reinforced epoxy resin plate is excellent and the smoke density of the glass fiber reinforced epoxy resin plate is reduced by controlling the content of the epoxy resin (namely the gum dipping amount).

Inventors

  • KE XIANCUI
  • KE BO
  • CHEN WEI
  • LI HUI
  • WU JUN
  • YIN XIN

Assignees

  • 湖北英索尔电子有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (9)

  1. 1. The preparation method of the glass fiber reinforced epoxy resin plate is characterized by comprising the following steps: S1, starting a gumming machine, putting 39-40 parts of epoxy resin into a gumming groove according to parts by weight, adding 10-13 parts of acetone for dilution, and then adding 9-10 parts of a curing agent, 1-1.5 parts of an accelerator, 2-2.2 parts of phosphoric acid activated rice hull ash and 3-3.5 parts of modified melamine urate to obtain a composite sizing material; S2, after the temperature of a pretreatment section and a post-baking section of the impregnator is stable, placing 50-52 parts of glass fiber cloth into the impregnator and starting the impregnator to obtain glass fiber impregnated rubber; S3, treating the glass fiber impregnated material obtained in the step S2 by adopting a high-temperature autoclave molding process, and then cutting to obtain the glass fiber reinforced epoxy resin plate; The preparation method of the modified melamine cyanurate comprises the following steps: B1, adding 80-83 g cyanuric acid into 400-500 g of water, heating to 70+/-2 ℃, and stirring for dissolution to obtain an initial cyanuric acid solution; B2, uniformly mixing 73-77 g of melamine and 5-5.5 g of polyethyleneimine, adding the mixture into the initial cyanuric acid solution obtained in the B1, heating to 90-95 ℃, stirring and reacting at constant temperature for 3-3.2 h to obtain a reaction material; And B3, sequentially dehydrating, drying and crushing the reaction material obtained in the step B2 to obtain the modified melamine cyanurate.
  2. 2. The method for preparing glass fiber reinforced epoxy resin board according to claim 1, wherein the method for preparing phosphoric acid activated rice hull ash comprises the following steps: A1, cleaning, drying and crushing rice hulls, mixing with 18-20 g/L phosphoric acid solution according to a mass ratio of 1 (4-6), soaking for 4-7 hours, and drying to obtain acid-soaked rice hulls; A2, roasting the acid-soaked rice hulls obtained in the step A1 in a muffle furnace, and cooling to obtain roasted solids; And A3, washing the roasted solid obtained in the step A2, drying in an oven, grinding and sieving to obtain the phosphoric acid activated rice hull ash.
  3. 3. The method for preparing the glass fiber reinforced epoxy resin board according to claim 2, wherein in A2, the temperature is raised to a roasting temperature of 400+/-10 ℃ at a rate of 2-3 ℃ per minute, and the roasting time is 1-1.2 h.
  4. 4. The preparation method of the glass fiber reinforced epoxy resin board according to claim 2, wherein in A3, the drying temperature is 95-100 ℃, and the drying time is 22-24 hours.
  5. 5. The preparation method of the glass fiber reinforced epoxy resin board according to claim 1, wherein in S2, the thickness of the glass fiber cloth is 0.25-0.28 mm, and the specific gravity of the glass fiber cloth is 290-300 g/m 2 .
  6. 6. The preparation method of the glass fiber reinforced epoxy resin board according to claim 1, wherein in the step S2, the temperature of the pretreatment section is stabilized at 30-36 ℃, and the temperature of the post-baking section is stabilized at 70-75 ℃.
  7. 7. The method for preparing a glass fiber reinforced epoxy resin board according to claim 1, wherein the curing agent comprises 4, 4-diamino-diphenyl methane and 4, 4-diamino-diphenyl sulfone in a mass ratio of 3:1.
  8. 8. The method for producing a glass fiber reinforced epoxy resin sheet according to claim 1, wherein the accelerator is an imidazole curing accelerator.
  9. 9. A glass fiber reinforced epoxy resin sheet material, characterized in that it is produced by the production method according to any one of claims 1 to 8.

Description

Glass fiber reinforced epoxy resin plate and preparation method thereof Technical Field The invention belongs to the technical field of fiber resin composite materials, and particularly relates to a glass fiber reinforced epoxy resin plate and a preparation method thereof. Background The glass fiber reinforced epoxy resin composite material has the advantages of light weight, designability, corrosion resistance, noise pollution reduction, low manufacturing cost and the like, replaces metal materials in the field of aviation and aerospace to manufacture bearing members and secondary bearing members, such as a fuselage, a wing and the like, and realizes weight reduction and multifunction of the structure. The epoxy resin belongs to inflammable polymers, and generates heat in the burning process, and simultaneously generates a large amount of incompletely burnt black smoke and toxic corrosive gas, so that the life and property safety of people is seriously endangered. The prior art shows that the content of the epoxy resin directly affects the mechanical property of the composite material, and when the content of the epoxy resin (namely the gum dipping amount) is low, the epoxy resin cannot be well soaked and bonded with the surface of the glass fiber to play a role in transferring load, so that the mechanical property of the composite material is reduced due to uneven stress of the glass fiber. Thus, in a certain range (mass fraction not exceeding 40%), the mechanical properties (tensile strength) of the composite material are improved with the increase of the epoxy resin content (i.e. the gum dipping amount). At the same time, however, the smoke density of the composite increases with the epoxy resin content (i.e., the gum dipping amount). Disclosure of Invention In order to solve the problems in the background art, the invention provides the glass fiber reinforced epoxy resin board and the preparation method thereof, and the smoke density of the glass fiber reinforced epoxy resin board is reduced while the mechanical property (tensile strength) of the glass fiber reinforced epoxy resin board is ensured by controlling the content of epoxy resin (namely the gum dipping amount). In order to achieve the above object, in a first aspect, the present invention provides a method for preparing a glass fiber reinforced epoxy resin board, comprising the steps of: S1, starting a gumming machine, putting 39-40 parts of epoxy resin into a gumming groove according to parts by weight, adding 10-13 parts of acetone for dilution, and then adding 9-10 parts of a curing agent, 1-1.5 parts of an accelerator, 2-2.2 parts of phosphoric acid activated rice hull ash and 3-3.5 parts of modified melamine urate to obtain a composite sizing material; S2, after the temperature of a pretreatment section and a post-baking section of the impregnator is stable, placing 50-52 parts of glass fiber cloth into the impregnator and starting the impregnator to obtain glass fiber impregnated rubber; And S3, treating the glass fiber impregnated material obtained in the step S2 by adopting a high-temperature autoclave molding process, and then cutting to obtain the glass fiber reinforced epoxy resin plate. Further, the preparation method of the phosphoric acid activated rice hull ash comprises the following steps: a1, cleaning, drying and crushing rice hulls, uniformly mixing the rice hulls with a phosphoric acid solution with the concentration of 18-20 g/L according to the impregnation mass ratio of 1 (4-6), soaking for 4-7 hours, and drying to obtain acid-soaked rice hulls; A2, roasting the acid-soaked rice hulls obtained in the step A1 in a muffle furnace, and cooling to obtain roasted solids; And A3, washing the roasted solid obtained in the step A2, drying in an oven, grinding and sieving to obtain the phosphoric acid activated rice hull ash. Further, in A2, the temperature is raised to the roasting temperature of 400+/-10 ℃ at the speed of 2-3 ℃ per minute, and the roasting time is 1-1.2 h. Further, in A3, the drying temperature is 95-100 ℃ and the drying time is 22-24 hours. Further, the preparation method of the modified melamine cyanurate comprises the following steps: B1, adding 80-83 g cyanuric acid into 400-500 g of water, heating to 70+/-2 ℃, and stirring for dissolution to obtain an initial cyanuric acid solution; B2, uniformly mixing 73-77 g of melamine and 5-5.5 g of polyethyleneimine, adding the mixture into the initial cyanuric acid solution obtained in the B1, heating to 90-95 ℃, stirring and reacting at constant temperature for 3-3.2 h to obtain a reaction material; And B3, sequentially carrying out filter pressing dehydration, flash evaporation drying and crushing on the reaction material obtained in the step B2 to obtain the modified melamine cyanurate. In S2, the thickness of the glass fiber cloth is 0.25-0.28 mm, and the specific gravity of the glass fiber cloth is 290-300 g/m 2. Further, in S2, the temperature of the pretreat