Fan counterweight process

Abstract

The invention provides a fan weight balancing process which comprises the following steps: extruding a solvent-free single-dosage photocuring composition to a proper position of a fan to be subjected to weight balancing by adopting a dispensing machine, and curing by adopting ultraviolet irradiation. The solvent-free single-dosage-form photocurable composition is a free radical type single-dosage-form photocurable composition or a cationic type single-dosage-form photocurable composition. The solvent-free single-dosage photocuring composition is prepared from the following raw materials: a colloid composition and an inorganic filler, wherein the weight of the inorganic filler is 0.5-4.0 times that of the colloid composition. The preparation raw materials of the colloid composition comprise a reactive monomer, resin, a photoinitiator and an auxiliary agent. The photoinitiator is selected to be a free radical type photoinitiator or a cationic photoinitiator according to the reaction type of the resin of the reactive monomer. The process is simple, a semi-automatic or full-automatic mode can be adopted, the precise balance weight problem of the fan can be effectively solved, additional device matching is not needed, the use cost is low, the curing time is short, and industrial batch assembly is facilitated.

Description

Technical Field

[0001] The present invention relates to the application field of adhesive materials, in particular to the application of adhesive materials in fans, and further to a fan counterweight process. Background Art

[0002] Fans are common in daily life. Even if the quality of the blades is different before use or the blades are damaged during daily use, it does not affect their use. However, system fans used in servers or workstations often need to reach a speed of tens of thousands of revolutions per minute and are used all year round without being shut down. Under such high-speed conditions, due to the accuracy of plastic injection, it cannot be guaranteed that each blade has completely equal weight, which will cause the center of mass to shift and not be on the shaft. Therefore, when rotating at high speed, the quality of each blade is often unequal, which will cause imbalance problems, causing friction, jamming and abnormal noise, making the fan prone to failure and unable to guarantee the air outlet speed, affecting the heat dissipation efficiency. And if the quality of each blade is very different, there may even be violent vibrations. In severe cases, the blades will hit the fan wall, causing the blades to break. Due to the inertia of the high speed of nearly 10,000 revolutions per minute, the fragments can splash inside the server or workstation, causing further damage.

[0003] The traditional method of balancing the blades is to use double-dose weighted clay, mix tens of milligrams of glue and stick them on the wind blades to achieve the function of weighting to maintain the mass balance of each blade. However, this manual method is extremely slow, and it is not easy to accurately locate the position where the weight needs to be added. If it cannot be accurately placed in the correct position, the balance of the center of mass cannot be achieved, causing the aforementioned problems. Some researchers also use automatic weighting devices. In addition to the matching weight blocks, additional shafts and other units are required, which increases the cost of use. The automatic weighting device with a rotating mechanism has the defect of wear. After long-term use, the weighting effect will deteriorate due to wear.

[0004] In addition, most of the counterweight glues currently used are two-component adhesive / putty materials, which require a reaction time of 5 to 30 minutes to form initial strength, and another 1 to 2 hours of curing to completely react and complete assembly operations, which is time-consuming and not conducive to mass assembly.

[0005] Therefore, a new weight balancing method is urgently needed to solve the weight balancing problem of the system fan of a server or workstation. Summary of the invention

[0006] The purpose of the present invention is to provide a fan weight balancing process, which is simple and can be semi-automatic or fully automatic. It can not only effectively solve the problem of accurate weight balancing of the fan, but also does not require additional device matching, has low use cost and short curing time, and is conducive to industrial batch assembly.

[0007] To achieve the above-mentioned purpose, the present invention provides a fan counterweighting process, wherein a solvent-free dosage form photocurable composition is extruded to an appropriate position of a fan to be counterweighted by a dispensing machine, and then cured by ultraviolet light. The solvent-free single-component photocurable composition is a free radical single-component photocurable composition or a cationic single-component photocurable composition. The raw materials for preparing the solvent-free single-component photocurable composition include a colloidal composition and an inorganic filler, the weight of the inorganic filler is 0.5 to 4.0 times the weight of the colloidal composition, the raw materials for preparing the colloidal composition include a reactive monomer, a resin, a photoinitiator and an auxiliary agent, and the photoinitiator is selected as a free radical photoinitiator or a cationic photoinitiator according to the reaction type of the reactive monomer and the resin.

[0008] In the technical solution adopted by the present invention, a dispensing machine is used for dispensing. Due to the positioning function of the dispensing machine, the solvent-free single-component photocurable composition can be accurately extruded to the determined position of the fan to be counterweighted, thereby achieving precise counterweighting. The fan counterweighting process of the present invention can achieve dispensing counterweighting by only using a dispensing machine and a single-component photocurable composition, without the need for additional device matching, and has low cost of use. Reactive monomers and resins are used for curing under the action of photoinitiators and ultraviolet light, and the curing time is short, which is conducive to industrial batch assembly. In addition, the single-component photocurable composition is a solvent-free system and is environmentally friendly to use.

[0009] As a technical solution of the present invention, the dispensing machine is a pneumatic dispensing machine, the range of the dispensing machine is 1 to 100 mL, and the pressure of the dispensing machine is 1 to 10 kg / cm 2 .

[0010] As a technical solution of the present invention, the illumination adopts a medium-high pressure mercury lamp or an LED lamp, and the illumination wavelength of the medium-high pressure mercury lamp is 150-420nm, and the illumination wavelength of the LED lamp is 365-405nm.

[0011] As a technical solution of the present invention, the solvent-free one-component photocurable composition is a free radical photocurable composition. The raw materials for preparing the free radical one-component photocurable composition include 25 to 45 parts of a first reactive monomer, 20 to 60 parts of a first resin, 3 to 15 parts of a first photoinitiator and 0.1 to 2.0 parts of an auxiliary agent, in terms of weight percentage.

[0012] As a technical solution of the present invention, the viscosity of the first reactive monomer is 1 to 5000 cP, and the molecular weight is less than or equal to 800. The first reactive monomer includes at least one of 2-hydroxyethyl methacrylate, 4-acryloylmorpholine, N-vinyl caprolactam, N-vinyl pyrrolidone, tetrahydrofurfuryl acrylate, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, propane trimethanol triacrylate, ethoxylated trimethylolpropane triacrylate and dipentaerythritol hexaacrylate.

[0013] As a technical solution of the present invention, the viscosity of the first resin is 500-1000000 cP, the molecular weight is greater than or equal to 1000, and the first resin includes at least one of epoxy acrylic resin, polyurethane (methyl) acrylic resin, polyester (methyl) acrylic resin, amine-modified polyether (methyl) acrylic resin, non-reactive (methyl) acrylic resin and non-reactive rubber.

[0014] As a technical solution of the present invention, the first photoinitiator includes at least one of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2-isopropylthioxanthone, 2-methyl-1-(4-methylthiophenyl)-2-morpholine-1-propanone and 2-benzyl-2-dimethylamino-1-(4-morpholinephenyl)butanone.

[0015] As a technical solution of the present invention, the solvent-free one-component photocurable composition is a cationic photocurable composition. The raw materials for preparing the cationic one-component photocurable composition include 5 to 40 parts of a second reactive monomer, 35 to 95 parts of a second resin, 5 to 15 parts of a second photoinitiator and 0.5 to 2.0 parts of an auxiliary agent, in terms of weight percentage.

[0016] As a technical solution of the present invention, the viscosity of the second reactive monomer is 5 to 500 cP, and the molecular weight is less than or equal to 1000, and the second reactive monomer includes at least one of 3-hydroxymethyl-3-ethyloxetane, 3-(2-hydroxyethyl)-3-methyloxetane and 2-(3-(hydroxymethyl)oxetane-3-yl)acetonitrile.

[0017] As a technical solution of the present invention, the viscosity of the second resin is greater than or equal to 300 cP, and the molecular weight is greater than or equal to 1000, and the second resin includes at least one of 3,4-epoxycyclohexyl methyl-3,4-epoxycyclohexyl carboxylate oligomer, 3,4-epoxycyclohexyl methyl methacrylate oligomer, 2,2-di(3,3'-epoxycyclohexyl)propane oligomer and 1,2-epoxy-4-vinylcyclohexane oligomer.

[0018] As a technical solution of the present invention, the second photoinitiator includes at least one of 4-(phenylthio)phenyldiphenylsulfonium hexafluoroantimonate, isopropyl ferrocenium hexafluorophosphate and thiophene derivatives.

[0019] As a technical solution of the present invention, the auxiliary agent includes at least one of a dispersant, a surface wetting agent and a leveling agent.

[0020] As a technical solution of the present invention, the inorganic filler is metal powder, alloy powder, metal oxide powder, sulfate, silicon dioxide or silicate. DETAILED DESCRIPTION

[0021] The present invention utilizes a dispensing machine and a solvent-free single-component photocurable composition to accurately balance the weight of the system fan of a server or workstation to maintain the weight balance of each blade in the fan. Specific operations may include: using a dispensing machine to extrude the solvent-free single-component photocurable composition to the appropriate position of the fan to be balanced, and then using ultraviolet light to cure it. Prior to this operation, first detect the weight of each blade on the fan, determine and mark the position of the blade to be balanced. The dispensing machine can be a pneumatic dispensing machine with a measuring range of 1 to 100 mL and a pressure of 1 to 10 kg / cm 2 The dispensing machine usually has a positioning function, so it can ensure that the dispensing position is the marked position. The solvent-free single-component photocurable composition is loaded into the syringe of the dispensing machine, and a pneumatic dispensing machine is used to dispense the glue at 1-10 kg / cm 2 The solvent-free single-component photocurable composition is pushed to the appropriate position on the fan under pressure, and the extrusion amount is controlled by pressure and dispensing time. The solvent-free single-component photocurable composition used in the present invention can be photocured in only 1 to 10 seconds, so it does not interfere with batch dispensing. The illumination adopts a medium-high pressure mercury lamp or an LED lamp. The illumination wavelength of the medium-high pressure mercury lamp is 150 to 420nm, the illumination wavelength of the LED lamp is 365 to 405nm, and the illumination intensity of the UV-A band is 1000 to 3500mJ / cm 2 .

[0022] The raw materials for preparing the solvent-free single-component photocurable composition of the present invention include a colloidal composition and an inorganic filler, with a specific gravity of 1.40 to 3.00 and a viscosity of 5000 to 8000 cP. The weight of the inorganic filler is 0.5 to 4.0 times the weight of the colloidal composition. Preferably, the weight of the inorganic filler is 1.0 to 4.0 times the weight of the colloidal composition. More preferably, the weight of the inorganic filler is 1.5 to 3.0 times the weight of the colloidal composition. The content of the inorganic filler in the solvent-free single-component photocurable composition is relatively high, and the density of the solvent-free single-component photocurable composition is high, so only a small amount of volume is required to meet the weight requirement, and the traces of post-processing are less obvious in appearance, and a small amount of solvent-free single-component photocurable composition is more suitable for use with a dispensing machine. The inorganic filler is a metal powder, an alloy powder, a metal oxide powder, a sulfate, silicon dioxide or a silicate. The use of metal oxides, sulfates or silicates further increases the specific gravity of the solvent-free single-component photocurable composition due to the high specific gravity of the particles themselves. Further, the inorganic filler is at least one of silicon oxide, magnesium oxide, zinc oxide, aluminum oxide, bismuth oxide, iron oxide, cobalt oxide, chromium trioxide, tin oxide, titanium dioxide, cerium oxide, copper oxide, sulfates (barium sulfate, zinc sulfate, calcium sulfate), and silicates (clay, talc, mica powder, asbestos powder, etc.).

[0023] The raw materials for preparing the colloid composition in the solvent-free single-component photocurable composition of the present invention include reactive monomers, resins, photoinitiators and auxiliary agents. The solvent-free single-component photocurable composition is a free radical type single-component photocurable composition or a cationic type single-component photocurable composition. The photoinitiator is selected as a free radical type photoinitiator or a cationic type photoinitiator according to the reaction type of the reactive monomer and the resin. A free radical type photocuring reaction or a cationic type photocuring reaction occurs through different reactive monomers, resins and initiators.

[0024] When the solvent-free single-component photocurable composition is a free radical single-component photocurable composition, the raw materials for preparing the free radical single-component photocurable composition include 25 to 45 parts of a first reactive monomer, 20 to 60 parts of a first resin, 3 to 15 parts of a first photoinitiator, and 0.1 to 2.0 parts of an auxiliary agent, by weight percentage. Among them, the viscosity of the first reactive monomer is 1 to 5000 cP, the molecular weight is less than or equal to 800, and the first reactive monomer includes at least one of 2-hydroxyethyl methacrylate, 4-acryloylmorpholine, N-vinyl caprolactam, N-vinyl pyrrolidone, tetrahydrofurfuryl acrylate, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, propane trimethanol triacrylate, ethoxylated trimethylolpropane triacrylate, and dipentaerythritol hexaacrylate. This first reactive monomer can wet the surface of the plastic blade and generate van der Waals force, and because of the high double bond density, it has the ability of rapid curing reaction, can adjust the viscosity of the system, increase the curing reaction speed and provide adhesion, etc. The viscosity of the first resin is 500-1000000 cP, and the molecular weight is greater than or equal to 1000. Preferably, the viscosity of the first resin is 1000-10000 cP, and the molecular weight is greater than or equal to 1000 and less than or equal to 10000. The first resin includes at least one of epoxy acrylic resin, polyurethane (methyl) acrylic resin, polyester (methyl) acrylic resin, amine-modified polyether (methyl) acrylic resin, non-reactive (methyl) acrylic resin and non-reactive rubber. This type of resin has a higher molecular weight and can provide basic colloid properties, can adjust the viscosity of the system, give the colloid cohesion and structural strength, supplement adhesion and fill inorganic fillers. The first photoinitiator includes at least one of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2-isopropylthioxanthone, 2-methyl-1-(4-methylthiophenyl)-2-morpholine-1-propanone and 2-benzyl-2-dimethylamino-1-(4-morpholinephenyl)butanone. Such initiators are free radical photocuring initiators that can receive UV light and generate free radicals to start free radical-induced photocuring reactions. The auxiliary agent includes at least one of a dispersant, a surface wetting agent and a leveling agent. The auxiliary agent is mainly used to adjust the dispersibility of the powder, the wettability and surface tension of the blade material, etc. The dispersant can be TEGO Dispers655, TEGO-Dispers 685, Deqian 9100, etc. The wetting agent can be Digo 245, Digo 500, Digo 505, Digo 510. The leveling agent can be Digo 432, Digo 450, Digo 2700, etc.

[0025] When the solvent-free single-component photocurable composition is a cationic single-component photocurable composition, the raw materials for preparing the cationic single-component photocurable composition include 5 to 40 parts of a second reactive monomer, 35 to 95 parts of a second resin, 5 to 15 parts of a second photoinitiator, and 0.5 to 2.0 parts of an auxiliary agent, by weight percentage. Among them, the viscosity of the second reactive monomer is 5 to 500 cP, the molecular weight is less than or equal to 1000, and the second reactive monomer includes at least one of 3-hydroxymethyl-3-ethyloxetane, 3-(2-hydroxyethyl)-3-methyloxetane, and 2-(3-(hydroxymethyl)oxetane-3-yl)acetonitrile. This second reactive monomer can adjust the viscosity of the system, increase the curing reaction speed, and provide adhesion. The viscosity of the second resin is greater than or equal to 300 cP, and the molecular weight is greater than or equal to 1000. Preferably, the viscosity of the second resin is 300 to 5000 cP, and the molecular weight is greater than or equal to 1000 and less than or equal to 10000. The second resin includes at least one of 4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate oligomer, 3,4-epoxycyclohexylmethyl methacrylate oligomer, 2,2-bis(3,3'-epoxycyclohexyl)propane oligomer and 1,2-epoxy-4-vinylcyclohexane oligomer. Such resins have a high molecular weight and can provide basic colloid properties, adjust the viscosity of the system, give the colloid cohesion and structural strength, supplement adhesion and fill inorganic fillers. The second photoinitiator includes at least one of 4-(phenylthio)phenyldiphenylsulfonium hexafluoroantimonate, isopropyl ferrocenium hexafluorophosphate and thiophene derivatives. Such initiators are free radical photocuring initiators that can receive UV light and produce Lewis acid to start the photocuring reaction of cationic polymerization. The auxiliary agent includes at least one of a dispersant, a surface wetting agent and a leveling agent. The auxiliary agent is mainly used to adjust the dispersibility of the powder, the wettability and surface tension of the blade material, etc. The dispersant may be TEGODispers655, TEGO-Dispers 685, Deqian 9100, etc. The wetting agent may be TEGO 245, TEGO 500, TEGO 505, TEGO 510. The leveling agent may be TEGO 432, TEGO 450, TEGO 2700, etc.

[0026] In order to better illustrate the purpose, technical scheme and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

[0027] Example 1

[0028] This embodiment is an application of a free radical single-component photocurable composition as a weight material in a server fan.

[0029] (1) First prepare a solvent-free single-component photocurable composition

[0030] The solvent-free single-component photocurable composition is a free radical type single-component photocurable composition, which includes a colloidal composition and barium sulfate, and the weight ratio of the barium sulfate to the colloidal composition is 1: 1. In terms of weight percentage, the raw materials for preparing the colloidal composition include 10 parts of tripropylene glycol diacrylate (Changxing EM223TF, viscosity of 15cP, molecular weight of 300), 20 parts of tetrahydrofurfuryl acrylate (Changxing, viscosity of 5cP, molecular weight of 156), 20 parts of polyurethane (methyl) acrylic resin (Covestro, viscosity of 1000cP, molecular weight of 1300), 3 parts of 1-hydroxycyclohexyl phenyl ketone (IGM), 2 parts of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide (IGM), 0.4 parts of TEGO Dispers 685 wetting and dispersing agent and 0.4 parts of Digo Glide 432 leveling agent.

[0031] Tripropylene glycol diacrylate, tetrahydrofurfuryl acrylate, polyurethane (methyl) acrylic resin, 1-hydroxycyclohexyl phenyl ketone and diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide were stirred and mixed in a yellow light room until all materials were dissolved to obtain a mixed solution. TEGO Dispers 685 wetting and dispersing agent and Digo Glide 432 leveling agent were added to the mixed solution, and the colloid composition was obtained by high-speed stirring at 1500 rpm for 30 minutes.

[0032] The colloid composition and barium sulfate are mixed and stirred evenly to obtain a solvent-free single-component photocurable composition with a specific gravity of 1.50 and a viscosity of 6000 cP, i.e., a glue material. After the glue material is poured into a syringe, it is centrifuged and degassed to obtain a glue material to be used.

[0033] (2) Place weights on the server fans

[0034] A pneumatic dispensing machine with a range of 100 mL is used to extrude the glue onto the fan blades. The pressure of the dispensing machine is 5 kg / cm 2 . Use 365-405nm UV LED light source, light intensity is 2000mJ / cm 2 , the glue material can be solidified by 8s of light exposure to complete the counterweight.

[0035] Example 2

[0036] This embodiment is an application of a free radical single-component photocurable composition as a weight material in a server fan.

[0037] (1) First prepare a solvent-free single-component photocurable composition

[0038] The solvent-free single-component photocurable composition is a free radical single-component photocurable composition, which includes a colloidal composition and barium sulfate, and the weight ratio of the barium sulfate to the colloidal composition is 1: 1. In terms of weight percentage, the raw materials for preparing the colloidal composition include 15 parts of tripropylene glycol diacrylate (Allnex, viscosity 13cP, molecular weight 300), 20 parts of tetrahydrofurfuryl acrylate (MIWON M150, viscosity 10cP, molecular weight 156), 35 parts of polyurethane (methyl) acrylic resin (Covestro, viscosity 1000cP, molecular weight 1300), 4 parts of phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide (IGM), 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone (IGM), 0.6 parts of TEGO Dispers 685 wetting and dispersing agent and 0.4 parts of Digao Glide 432 leveling agent.

[0039] Tripropylene glycol diacrylate, tetrahydrofurfuryl acrylate, polyurethane (methyl) acrylic resin, phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide (IGM) and 2-hydroxy-2-methyl-1-phenyl-1-propanone were stirred and mixed in a yellow light room until all materials were dissolved to obtain a mixed solution. TEGO Dispers 685 wetting and dispersing agent and Digao Glide 432 leveling agent were added to the mixed solution, and the colloid composition was obtained by high-speed stirring at 1500 rpm for 30 minutes.

[0040] The colloid composition and iron powder with a particle size of less than 100 μm are mixed and stirred evenly to obtain a solvent-free single-component photocurable composition with a specific gravity of 2.50 and a viscosity of 6000 cP, i.e., a glue material. After the glue material is poured into a syringe, it is centrifuged and degassed to obtain a glue material to be used.

[0041] (3) Place weights on the server fans

[0042] A pneumatic dispensing machine with a range of 100 mL is used to extrude the glue onto the fan blades. The pressure of the dispensing machine is 8 kg / cm 2 . Use 365~405nm UV LED light source, light intensity is 3000mJ / cm 2 , the glue material can be solidified by light exposure for 9 seconds to complete the counterweight.

[0043] Example 3

[0044] This embodiment is an application of a cationic single-component photocurable composition as a weight material in a server fan.

[0045] (1) First prepare a solvent-free single-component photocurable composition

[0046] The solvent-free single-component photocurable composition is a cationic single-component photocurable composition, which includes a colloidal composition and barium sulfate, and the weight ratio of the barium sulfate to the colloidal composition is 2: 1. In terms of weight percentage, the raw materials for preparing the colloidal composition include 25 parts of 3-hydroxymethyl-3-ethyloxetane (Merck, viscosity of 5 cP, molecular weight of 102), 50 parts of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate oligomer (Haorong, viscosity of 500 cP, molecular weight of 1200), 6 parts of 4-(phenylthio)phenyldiphenylsulfonium hexafluoroantimonate (Wuhan Kemik Biological), 0.3 parts of Digo TEGO Dispers 655, 0.5 parts of Digo 505 and 0.6 parts of Digo 450.

[0047] 3-Hydroxymethyl-3-ethyloxetane, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate oligomer and 4-(phenylthio)phenyl diphenylsulfonium hexafluoroantimonate were stirred and mixed in a yellow light chamber until all materials were dissolved to obtain a mixed solution. TEGO Dispers 655, TEGO 505 and TEGO 450 were added to the mixed solution, and the colloidal composition was obtained by high-speed stirring at 1800 rpm for 40 minutes.

[0048] The colloid composition and barium sulfate are mixed and stirred evenly to obtain a solvent-free single-component photocurable composition with a specific gravity of 1.60 and a viscosity of 7500 cP, i.e., a glue material. After the glue material is poured into a syringe, it is centrifuged and degassed to obtain a glue material to be used.

[0049] (4) Place weights on the server fans

[0050] A pneumatic dispensing machine with a range of 100 mL is used to extrude the glue onto the fan blades. The pressure of the dispensing machine is 8 kg / cm 2 . Use 365-405nm UV LED light source, light intensity is 2300mJ / cm 2 , the glue material can be solidified by 10s of light exposure to complete the weighting.

[0051] Example 4

[0052] This embodiment is an application of a cationic single-component photocurable composition as a weight material in a server fan.

[0053] (1) First prepare a solvent-free single-component photocurable composition

[0054] The solvent-free single-component photocurable composition is a cationic single-component photocurable composition, which includes a colloidal composition, magnesium oxide and aluminum oxide, and the total weight of magnesium oxide and aluminum oxide and the weight ratio of the colloidal composition are 3: 1. In terms of weight percentage, the raw materials for preparing the colloidal composition include 10 parts of tripropylene glycol diacrylate (Changxing EM223TF, viscosity of 15cP, molecular weight of 300), 20 parts of tetrahydrofurfuryl acrylate (Changxing, viscosity of 5cP, molecular weight of 156), 20 parts of polyurethane (methyl) acrylic resin (Covestro, viscosity of 1000cP, molecular weight of 1300), 3 parts of 1-hydroxycyclohexyl phenyl ketone (IGM), 2 parts of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide (IGM), 0.4 parts of TEGO Dispers 685 wetting and dispersing agent and 0.4 parts of Digo Glide 432 leveling agent.

[0055] Tripropylene glycol diacrylate, tetrahydrofurfuryl acrylate, polyurethane (methyl) acrylic resin, 1-hydroxycyclohexyl phenyl ketone and diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide were stirred and mixed in a yellow light room until all materials were dissolved to obtain a mixed solution. TEGO Dispers 685 wetting and dispersing agent and Digo Glide 432 leveling agent were added to the mixed solution, and the colloid composition was obtained by high-speed stirring at 1500 rpm for 30 minutes.

[0056] The colloid composition, magnesium oxide and aluminum oxide are mixed and stirred evenly to obtain a solvent-free single-component photocurable composition with a specific gravity of 1.50 and a viscosity of 5500 cP, i.e., a glue material. After the glue material is poured into a syringe, it is centrifuged and degassed to obtain a glue material to be used.

[0057] (5) Place weights on the server fans

[0058] A pneumatic dispensing machine with a range of 100 mL is used to extrude the glue onto the fan blades. The pressure of the dispensing machine is 5 kg / cm 2 . Use 365-405nm UV LED light source, light intensity is 2500mJ / cm 2 , the glue material can be solidified by light for 5s to complete the counterweight.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it is not limited to those listed in the embodiments. Those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A fan weight balancing process, characterized in that: A dispensing machine is used to extrude a solvent-free single-component photocurable composition to an appropriate position of a fan to be counterweighted, and then ultraviolet light is used for curing. The solvent-free single-component photocurable composition is a free radical single-component photocurable composition or a cationic single-component photocurable composition. The raw materials for preparing the solvent-free single-component photocurable composition include a colloid composition and an inorganic filler. The weight of the inorganic filler is 0.5 to 4.0 times the weight of the colloid composition. The raw materials for preparing the colloid composition include a reactive monomer, a resin, a photoinitiator and an auxiliary agent. The photoinitiator is selected as a free radical photoinitiator or a cationic photoinitiator according to the reaction type of the reactive monomer and the resin.

2. A fan weight balancing process according to claim 1, characterized in that: The dispensing machine is a pneumatic dispensing machine, the measuring range of the dispensing machine is 1-100 mL, and the pressure of the dispensing machine is 1-10 kg / cm 2 The illumination adopts a medium-high pressure mercury lamp or an LED lamp, and the illumination wavelength of the medium-high pressure mercury lamp is 150-420nm, and the illumination wavelength of the LED lamp is 365-405nm.

3. A fan weight balancing process according to claim 1, characterized in that: The solvent-free one-component photocurable composition is a free radical one-component photocurable composition. The raw materials for preparing the free radical one-component photocurable composition include, by weight percentage, 25 to 45 parts of a first reactive monomer, 20 to 60 parts of a first resin, 3 to 15 parts of a first photoinitiator and 0.1 to 2.0 parts of an auxiliary agent.

4. A fan weight balancing process according to claim 3, characterized in that: The viscosity of the first reactive monomer is 1 to 5000 cP, and the molecular weight is less than or equal to 800. The first reactive monomer includes at least one of 2-hydroxyethyl methacrylate, 4-acryloylmorpholine, N-vinyl caprolactam, N-vinyl pyrrolidone, tetrahydrofurfuryl acrylate, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, propane trimethanol triacrylate, ethoxylated trimethylolpropane triacrylate and dipentaerythritol hexaacrylate.

5. A fan weight balancing process according to claim 3, characterized in that: The viscosity of the first resin is 500-1000000 cP, and the molecular weight is greater than or equal to 1000. The first resin includes at least one of epoxy acrylic resin, polyurethane (methyl) acrylic resin, polyester (methyl) acrylic resin, amine-modified polyether (methyl) acrylic resin, non-reactive (methyl) acrylic resin and non-reactive rubber.

6. A fan weight balancing process according to claim 3, characterized in that: The first photoinitiator includes at least one of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2-isopropylthioxanthone, 2-methyl-1-(4-methylthiophenyl)-2-morpholine-1-propanone and 2-benzyl-2-dimethylamino-1-(4-morpholinephenyl)butanone.

7. A fan weight balancing process according to claim 1, characterized in that: The solvent-free one-component photocurable composition is a cationic one-component photocurable composition. The raw materials for preparing the cationic one-component photocurable composition include 5 to 40 parts of a second reactive monomer, 35 to 95 parts of a second resin, 5 to 15 parts of a second photoinitiator and 0.5 to 2.0 parts of an auxiliary agent in terms of weight percentage.

8. A fan weight balancing process according to claim 7, characterized in that: The viscosity of the second reactive monomer is 5 to 500 cP, and the molecular weight is less than or equal to 1000. The second reactive monomer includes at least one of 3-hydroxymethyl-3-ethyloxetane, 3-(2-hydroxyethyl)-3-methyloxetane and 2-(3-(hydroxymethyl)oxetane-3-yl)acetonitrile.

9. A fan weight balancing process according to claim 7, characterized in that: The viscosity of the second resin is greater than or equal to 300 cP, and the molecular weight is greater than or equal to 1000. The second resin includes at least one of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate oligomer, 3,4-epoxycyclohexylmethyl methacrylate oligomer, 2,2-bis(3,3'-epoxycyclohexyl)propane oligomer and 1,2-epoxy-4-vinylcyclohexane oligomer.

10. A fan weight balancing process according to claim 7, characterized in that: The second photoinitiator includes at least one of 4-(phenylthio)phenyldiphenylsulfonium hexafluoroantimonate, cumene ferrocenium hexafluorophosphate and thiophene derivatives.