Formula and manufacturing process of glass fiber reinforced plastic tray nut

Abstract

The invention relates to the technical field of glass fiber reinforced plastic tray nut machining, in particular to a glass fiber reinforced plastic tray nut formula and a manufacturing process, the glass fiber reinforced plastic tray nut formula comprises a first liquid material, a second liquid material, a first dry material, a first powder material, a second powder material and a third powder material, the first liquid material is unsaturated polyester resin and a curing agent, and the second liquid material is a silane coupling agent; the first part of dry material is chopped glass fiber, the first part of powder material is needle-like wollastonite, the second part of powder material is fumed silica, and the third part of powder material is zinc stearate. According to the design, the needle-like wollastonite is used as a filler and a reinforcing agent, the fumed silica is used as a reinforcing agent, and the silane coupling agent is used for improving the interface bonding strength; finally, the strength and wear resistance of the glass fiber reinforced plastic tray nut are improved, the manufacturing process is optimized, uniform dispersion of materials is achieved, the overall performance of the product is improved, and meanwhile the manufacturing process is simple, easy to operate, suitable for industrial production and especially suitable for popularization in the field of supporting.

Description

Technical Field

[0001] The present invention relates to the technical field of processing of FRP tray nuts, and particularly relates to a formula and manufacturing process of FRP tray nuts. Background Art

[0002] Bolt support is the most widely used support method in the current coal mine field. The support theory and practice of bolts in coal roadways have been mature. During the bolt support process, the quality of the support construction directly determines the control status of the surrounding rock of the roadway. During the construction process of FRP bolt support, the bearing capacity of the FRP tray nut is the decisive factor affecting the support effect.

[0003] However, with the increase in the mining depth of the mine, the mine pressure gradually increases. Under high mine pressure conditions, the failure of FRP bolt support is mostly due to the damage of the FRP tray nut. Existing tests show that most of the failures of FRP bolt support occur at the position of the FRP tray nut. The failure form is mainly manifested as the splitting of the FRP tray nut, and the bolt rod generally does not fail. Moreover, it is found in the daily FRP bolt detection tests that the failure form in the tests mainly occurs at the position of the FRP tray nut. Summary of the Invention

[0004] The purpose of the present invention is to provide a formula and manufacturing process of FRP tray nuts, to solve the problems in the prior art that with the increase in the mining depth of the mine, the mine pressure gradually increases, under high mine pressure conditions, the failure of FRP bolt support is mostly due to the damage of the FRP tray nut, existing tests show that most of the failures of FRP bolt support occur at the position of the FRP tray nut, the failure form is mainly manifested as the splitting of the FRP tray nut, the bolt rod generally does not fail, and it is found in the daily FRP bolt detection tests that the failure form in the tests mainly occurs at the position of the FRP tray nut.

[0005] To achieve the above purpose, the present invention provides a formula of FRP tray nuts, including a first portion of liquid material, a second portion of liquid material, a first portion of dry material, a first portion of powder material, a second portion of powder material, and a third portion of powder material. The first portion of liquid material is unsaturated polyester resin and curing agent, the second portion of liquid material is silane coupling agent, the first portion of dry material is chopped glass fiber, the first portion of powder material is acicular wollastonite, the second portion of powder material is fumed silica, and the third portion of powder material is zinc stearate.

[0006] The present invention also provides a manufacturing process of FRP tray nuts. The manufacturing process of the FRP tray nuts includes the following steps:

[0007] Step S1: Add the first portion of liquid material, the first portion of powder material, and the third portion of powder material into a mixing device respectively for preliminary mixing.

[0008] Step S2: Then add the second portion of powder material and the second portion of liquid material, and conduct high-speed stirring and ultrasonic dispersion to ensure that the second portion of powder material is evenly dispersed in the resin matrix;

[0009] Step S3: Then transfer the well-dispersed slurry to a kneader, gradually add the first portion of dry material and stir for 1 h to evenly stir all the materials in the formula and obtain the prepreg;

[0010] Step S4: Accurately weigh the mixed prepreg, put it into a mold; set the pressure of the hydraulic press, the molding temperature and the molding time, and under the action of the hydraulic press, thermally press the premix in the mold to obtain a semi-finished FRP tray nut;

[0011] Step S5: Finally, perform post-treatment processes such as trimming and grinding on the semi-finished FRP tray nut to meet the appearance requirements of the product. At the same time, conduct quality inspection on the product to ensure that the performance of the product meets the relevant standards.

[0012] Among them, in Step S1, the weight of the unsaturated polyester resin in the first portion of liquid material is 20 kg, and the weight of the curing agent is 160 g.

[0013] Among them, in Step S1, the weight of the acicular wollastonite in the first portion of powder material is 20 kg, and the mesh number is 1250 mesh.

[0014] Among them, in Step S1, the weight of the zinc stearate in the third portion of powder material is 1 kg.

[0015] Among them, in Step S2, the weight of the fumed silica in the second portion of powder material is 2 kg, and the mesh number is 15000 mesh.

[0016] Among them, in Step S2, the weight of the silane coupling agent in the second portion of liquid material is 800 g.

[0017] Among them, in Step S3, the weight of the chopped glass fiber in the first portion of dry material is 40 kg, and the length is 5 cm.

[0018] Among them, in Step S4, the pressure of the hydraulic press is 10 MPa, the molding temperature is 150 °C, and the molding time is 3 min to 5 min.

[0019] A formula and manufacturing process for a fiberglass tray nut of the present invention, including a first liquid material, a second liquid material, a first dry material, a first powder material, a second powder material, and a third powder material. The first liquid material is unsaturated polyester resin and a curing agent, the second liquid material is a silane coupling agent, the first dry material is chopped glass fiber, the first powder material is acicular wollastonite, the second powder material is fumed silica, and the third powder material is zinc stearate. Through adding acicular wollastonite as a filler and reinforcing agent, adding fumed silica as a reinforcing agent, and adding a silane coupling agent to improve the interfacial bonding strength, the strength and wear resistance of the fiberglass tray nut are significantly improved. Then, through optimizing the manufacturing process, the uniform dispersion of materials is achieved, and the overall performance of the product is improved. The manufacturing process of the present invention is simple and easy to operate, suitable for industrial production, especially suitable for popularization in the support field, and has broad prospects. This effectively solves the problem that as the mining depth of the mine increases, the mine pressure gradually increases. Under high mine pressure conditions, the failure of fiberglass bolt support mostly occurs in the fiberglass tray nut. Existing tests show that most of the failures of fiberglass bolt support occur at the position of the fiberglass tray nut. The failure form is mainly manifested as the splitting of the fiberglass tray nut, and the bolt body generally does not fail. Moreover, it is found in the daily fiberglass bolt detection test that the failure form in the test mainly occurs at the position of the fiberglass tray nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a simplified flowchart of the manufacturing process of the fiberglass tray nut provided by the present invention.

[0022] Figure 2 It is a specific flowchart of the manufacturing process of the fiberglass tray nut provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation of the present invention.

[0024] Please refer to Figures 1 to 2, the present invention provides a formula for fiberglass pallet nuts, including a first liquid material, a second liquid material, a first dry material, a first powder material, a second powder material, and a third powder material. The first liquid material is unsaturated polyester resin and a curing agent, the second liquid material is a silane coupling agent, the first dry material is chopped glass fiber, the first powder material is acicular wollastonite, the second powder material is fumed silica, and the third powder material is zinc stearate.

[0025] The present invention also provides a manufacturing process for fiberglass pallet nuts. The manufacturing process for fiberglass pallet nuts includes the following steps:

[0026] Step S1: Add the first liquid material, the first powder material, and the third powder material into a mixing device respectively for preliminary mixing;

[0027] Step S2: Then add the second powder material and the second liquid material, and perform high-speed stirring and ultrasonic dispersion to ensure that the second powder material is evenly dispersed in the resin matrix;

[0028] Step S3: Transfer the well-dispersed slurry to a kneader, gradually add the first dry material and stir for 1 h to stir all the materials in the formula evenly to obtain a prepreg;

[0029] Step S4: Weigh the mixed prepreg accurately, put it into a mold; set the pressure of the hydraulic press, the molding temperature, and the molding time, and under the action of the hydraulic press, hot-press the premix in the mold to form a semi-finished fiberglass pallet nut;

[0030] Step S5: Finally, perform post-treatment processes such as trimming and polishing on the semi-finished fiberglass pallet nut to meet the appearance requirements of the product. At the same time, conduct quality inspections on the product to ensure that the performance of the product meets relevant standards.

[0031] In this embodiment, the design significantly improves the strength and wear resistance of the FRP tray nut by adding acicular wollastonite as a filler and reinforcing agent, adding fumed silica as a strengthening agent, and adding a silane coupling agent to improve the interfacial bonding strength. Then, by optimizing the manufacturing process, the uniform dispersion of materials is achieved, and the overall performance of the product is improved. The manufacturing process of the present invention is simple and easy to operate, suitable for industrial production, especially suitable for popularization in the support field, and has broad prospects, thus effectively solving the problem that as the mining depth of the mine increases, the mine pressure gradually increases. Under high mine pressure conditions, the failure of FRP bolt support is mostly due to the damage of the FRP tray nut. Existing tests show that most of the failures of FRP bolt support occur at the position of the FRP tray nut, and the failure form is mainly the splitting of the FRP tray nut, and the bolt body generally does not fail. Moreover, it is found in the daily FRP bolt detection test that the failure form in the test mainly occurs at the position of the FRP tray nut.

[0032] Among them, in step S1, the weight of the unsaturated polyester resin in the first portion of liquid material is 20 kg, and the weight of the curing agent is 160 g. The unsaturated polyester resin is used as the main bonding material.

[0033] Among them, in step S1, the weight of the acicular wollastonite in the first portion of powder material is 20 kg, and the mesh number is 1250 mesh. The acicular wollastonite is used as a filler and reinforcing agent. Acicular wollastonite belongs to a chain-like metasilicate, and its microstructure is fibrous and acicular. Due to its special crystal morphology and crystal structure, its properties are determined. Wollastonite powder can improve the impact strength, enhance the fluidity, and improve the tensile strength, impact strength, linear elongation, and mold shrinkage rate. The microstructure of acicular wollastonite is fibrous and acicular, which serves as both an extender and a reinforcing agent for the FRP tray and FRP nut.

[0034] Among them, in step S1, the weight of zinc stearate in the third portion of powder material is 1 kg. Zinc stearate is used as a demolding agent. Using zinc stearate as an internal demolding agent can also improve the surface quality of FRP products. During the demolding process, zinc stearate can reduce the damage of the mold to the surface of the product, making the surface of the product smoother and flatter, which improves the aesthetics and quality of the product and meets the needs of customers for high-quality FRP products.

[0035] Among them, in step S2, the weight of the fumed silica in the second powder material is 2 kg, and the mesh number is 15,000 meshes. As a reinforcing agent, the fumed silica has high purity and high dispersibility. The high specific surface area and strong adsorption force of the fumed silica enable it to closely combine with the FRP matrix material to form a firm interfacial layer. This firm interfacial layer helps to improve the bonding force between FRP molecules, thereby enhancing the strength and elongation of the material. The high fluidity and small size effect of the fumed silica enable it to be evenly distributed in the FRP, forming a dense microstructure. This structure makes the surface of the FRP more dense, fine and clean, with a smaller friction coefficient and greatly enhanced wear resistance. At the same time, the nanoparticles of the fumed silica can also fill the tiny pores in the FRP, further improving the surface finish of the material. The fumed silica can strongly reflect ultraviolet rays, thus effectively protecting the FRP from ultraviolet erosion, which helps to extend the service life of the FRP and improve its anti-aging performance. When the FRP is subjected to external impact, the two-phase interface formed by the fumed silica particles and the FRP matrix can jointly bear the impact force, thereby consuming a considerable part of the impact energy. This makes the FRP have excellent toughening effect and good mechanical properties. The fumed silica is a fine and special amorphous silica product, with small primary particle size (7 - 40 nm), large specific surface area (100 - 400 m 2 / g), high purity (SiO 2 content not less than 99.8%), etc., and is very suitable as a reinforcing agent for the FRP tray nut.

[0036] Among them, in step S2, the weight of the silane coupling agent in the second liquid material is 800 g. The silane coupling agent is used to improve the interfacial bonding force between the fumed silica, the acicular wollastonite, the chopped glass fiber and the resin matrix. The silane coupling agent plays a crucial role in the FRP tray nut. The FRP tray nut is a new type of high-performance composite material composed of glass fiber and resin, and the silane coupling agent is the key additive to enhance the performance of this composite material. The following are the specific functions of the silane coupling agent in the FRP: The silane coupling agent reacts with the surface of the glass fiber through a chemical reaction to form chemical bonds, thereby improving the adhesion between the resin, the glass fiber and the filler. This enhanced adhesion helps to prevent the peeling between the main materials, thereby improving the overall strength and hardness of the FRP; By adding the silane coupling agent, the silane coupling agent builds a "molecular bridge" between the interfaces of inorganic and organic substances, connecting two materials with very different properties into a unified whole and enhancing the interfacial bonding strength. The mechanical properties of the FRP tray nut can be significantly improved, including key performance indicators such as the bearing capacity and compressive strength of the material.

[0037] Among them, in step S3, the weight of the chopped glass fiber in the first portion of dry material is 40 kg, the length is 5 cm, and the chopped glass fiber is used as the main reinforcing material.

[0038] Among them, in step S4, the pressure of the hydraulic press is 10 MPa, the molding temperature is 150 °C, and the molding time is 3 min to 5 min.

[0039] In the present invention, two embodiments are also provided, specifically referring to the following;

[0040] Embodiment 1:

[0041] Step 1: Add the first portion of liquid material, the first portion of powder material, and the third portion of powder material into a mixing device for preliminary mixing;

[0042] Step 2: Then add the second portion of powder material and the second portion of liquid material, and perform high-speed stirring and ultrasonic dispersion to ensure that the second portion of powder material is uniformly dispersed in the resin matrix;

[0043] Step 3: Transfer the dispersed slurry to a kneader, gradually add the first portion of dry material, and stir for 1 h to uniformly stir all the materials in the formula to obtain a prepreg;

[0044] Step 4: Weigh a certain amount of premixed material according to the process requirements, and load the weighed premixed material into a tray mold;

[0045] Step 5: Set the pressure of the hydraulic press to 10 MPa, the molding temperature to 150 °C, and the molding time to 5 min. Under the action of the hydraulic press, the premixed material is hot-pressed and formed in the tray mold to obtain a tray blank;

[0046] Step 6: Take out the tray blank from the tray mold, and use a grinding wheel to process the burrs of the tray blank to complete the preparation of the fiberglass tray nut.

[0047] Embodiment 2:

[0048] Step 1: Add the first portion of liquid material, the first portion of powder material, and the third portion of powder material into a mixing device for preliminary mixing;

[0049] Step 2: Then add the second portion of powder material and the second portion of liquid material, and perform high-speed stirring and ultrasonic dispersion to ensure that the second portion of powder material is uniformly dispersed in the resin matrix;

[0050] Step 3: Transfer the dispersed slurry to a kneader, gradually add the first portion of dry material, and stir for 1 h to uniformly stir all the materials in the formula to obtain a prepreg;

[0051] Step 4: Weigh a certain amount of premixed material according to the process requirements, and load the weighed premixed material into a tray mold;

[0052] Step 5: Set the pressure of the hydraulic press to 10 MPa, the molding temperature to 150 °C, and the molding time to 3 min. Under the action of the hydraulic press, hot-press the premix in the tray mold to obtain a tray blank.

[0053] Step 6: Take out the tray blank from the tray mold and use a angle grinder to process the burrs of the tray blank to complete the preparation of the FRP tray nut.

[0054] The above-disclosed is only a preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. A glass fiber reinforced plastic pallet nut formula, characterized in that: The invention comprises a first portion of liquid material, a second portion of liquid material, a first portion of dry material, a first portion of powder material, a second portion of powder material and a third portion of powder material, wherein the first portion of liquid material is an unsaturated polyester resin and a curing agent, the second portion of liquid material is a silane coupling agent, the first portion of dry material is chopped glass fiber, the first portion of powder material is needle-shaped wollastonite, the second portion of powder material is fumed silica, and the third portion of powder material is zinc stearate.

2. A process for manufacturing glass fiber reinforced plastic pallet nuts, applied to the glass fiber reinforced plastic pallet nut formula according to claim 1, characterized in that: The steps include: Step S1: adding the first portion of liquid material, the first portion of powder material and the third portion of powder material into a mixing device respectively for preliminary mixing; Step S2: then adding the second portion of powder and the second portion of liquid, performing high-speed stirring and ultrasonic dispersion to ensure that the second portion of powder is evenly dispersed in the resin matrix; Step S3: the dispersed slurry is transferred to a kneader, the first portion of dry material is gradually added and stirred for 1 hour, all materials in the formula are stirred evenly to obtain a prepreg; Step S4: accurately weigh the mixed prepreg and put it into the mold; set the hydraulic press pressure, molding temperature and molding time, and hot-press the premix in the mold under the action of the hydraulic press to obtain a semi-finished glass fiber reinforced plastic pallet nut; Step S5: Finally, the semi-finished fiberglass pallet nut is subjected to post-processing steps of trimming and grinding to meet the appearance requirements of the product. At the same time, the product is quality inspected to ensure that the performance of the product meets the relevant standards.

3. The process for manufacturing glass fiber reinforced plastic pallet nuts according to claim 1, characterized in that: In step S1, the weight of the unsaturated polyester resin in the first liquid material is 20 kg, and the weight of the curing agent is 160 g.

4. The process for manufacturing glass fiber reinforced plastic pallet nuts according to claim 2, characterized in that: In step S1, the weight of the needle-shaped wollastonite in the first portion of powder is 20 kg, and the mesh size is 1250 mesh.

5. The process for manufacturing glass fiber reinforced plastic pallet nuts according to claim 3, characterized in that: In step S1, the weight of zinc stearate in the third portion of powder is 1 kg.

6. The process for manufacturing glass fiber reinforced plastic pallet nuts according to claim 4, characterized in that: In step S2, the weight of the fumed silica in the second portion of powder is 2 kg, and the mesh size is 15000 mesh.

7. The process for manufacturing glass fiber reinforced plastic pallet nuts according to claim 5, characterized in that: In step S2, the weight of the silane coupling agent in the second liquid material is 800 g.

8. The process for manufacturing glass fiber reinforced plastic pallet nuts according to claim 7, characterized in that: In step S3, the weight of the chopped glass fibers in the first portion of dry material is 40 kg and the length is 5 cm.

9. The process for manufacturing glass fiber reinforced plastic pallet nuts according to claim 8, characterized in that: In step S4, the hydraulic press pressure is 10 MPa, the molding temperature is 150° C., and the molding time is 3 min to 5 min.

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