Fast-curing potting filling glue for repairing defects of resin products and preparation method of fast-curing potting filling glue

Abstract

The invention relates to the technical field of chemical materials, in particular to preparation of a fast-curing potting filling adhesive for repairing a resin product. The method comprises the following steps: (1) preparing photosensitive resin and shadowless glue; (2) preparing potting filling glue by mixing photosensitive resin and shadowless glue; (3) adjusting the viscosity of the potting filling glue; and (4) the anti-yellowing performance is improved. The potting filling adhesive is prepared by compounding and mixing urethane acrylate, epoxy acrylate, a photoinitiator, a diluent, a light stabilizer and an anti-yellowing aid, wherein photosensitive resin is prepared from the following components in parts by mass: 20 to 60 parts of epoxy acrylate, 30 to 55 parts of urethane acrylate and 2 to 10 parts of photoinitiator; the shadowless glue is prepared from the following components in parts by mass: 55 to 70 parts of polyurethane acrylate, 25 to 40 parts of monomer diluent and 1 to 5 parts of photoinitiator. Then, the potting filling glue is prepared according to the mass part ratio of the photosensitive resin to the shadowless glue being (15-30): (70-85), and the prepared potting filling glue is short in curing time.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical materials, and specifically relates to the preparation of a fast-curing potting and filling glue for repairing resin products. The glue is quickly cured by ultraviolet irradiation, has excellent adhesion and durability, and is suitable for repairing and reinforcing resin products. Background Art

[0002] Filling glue is widely used in the repair process of resin products. Traditional potting and filling glue usually uses epoxy resin or polyurethane materials, which have good mechanical properties and weather resistance, and can fill cracks and repair damage. However, this type of glue usually requires a long curing time, and some even take several hours to a day to fully cure. In addition, some potting glues also require specific temperature or humidity conditions to complete curing, which brings many inconveniences to actual operations, especially in scenarios that require quick repairs, and the efficiency is low. In addition, the cured potting and filling glue is also insufficient in terms of UV resistance, high temperature resistance, etc., and long-term use may cause aging or cracking problems, affecting the repair effect.

[0003] In contrast, ultraviolet (UV) curing repair glue, as a new type of material, has shown significant advantages in the process of repairing resin products. Due to its ability to cure quickly under ultraviolet light, UV repair glue has become a common choice for repairing cracks, scratches and surface damage of various resin materials. It can achieve local filling and repair through simple application and UV irradiation, without the need for specific temperature or humidity conditions, and is particularly suitable for problem scenarios that need to be solved quickly, such as the repair of furniture, auto parts and electronic products. Its convenience and efficiency have attracted widespread attention in industry and daily life. The cured UV repair glue has excellent durability and resistance to UV aging, and can ensure the stability of the repaired part in long-term use. Therefore, UV curing repair glue has obvious technical advantages and application prospects in the rapid repair and high-quality repair of resin products.

[0004] However, existing UV repair glues still have some technical deficiencies. First, the adhesion of some UV glues is not strong enough, and it is difficult to provide sufficient mechanical support when repairing resin products with high strength requirements. Secondly, although the curing time is relatively fast, the curing effect is not ideal when repairing thick or deep layers, and it may take a long time to fully harden. In addition, some UV glues have insufficient anti-yellowing performance during use. Especially when exposed to ultraviolet rays or high temperature environments for a long time, the repaired area is prone to yellowing, affecting the appearance and long-term stability of the material.

[0005] Therefore, developing a potting and filling glue with strong adhesion, short curing time, and excellent anti-yellowing performance has become an important trend in current technological development. This type of glue can not only meet the needs of efficient repair, but also effectively extend the service life of the repaired part and improve the overall performance of the resin product. Summary of the invention

[0006] The purpose of the present invention is to provide a fast-curing potting and filling glue for repairing defects in resin products and a preparation method thereof, aiming to solve the problems of insufficient adhesion, long curing time, and easy yellowing of the repaired area in the prior art. By improving the composition formula of the glue and optimizing the curing mechanism, the present invention can significantly improve the effect of the glue in repairing resin products, so that it can be fully cured in a very short time, while maintaining good appearance and performance under long-term exposure to ultraviolet rays or high temperature environments.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The present invention provides a method for preparing a potting and filling glue, comprising the following steps:

[0009] (1) Preparation of photosensitive resin:

[0010] a) placing epoxy acrylate and polyurethane acrylate in a stirring tank and mixing them thoroughly;

[0011] b) adding a photoinitiator to the mixture of step a), stirring until uniform, and ensuring that the photoinitiator is fully dissolved;

[0012] c) After stirring evenly, the mixture is allowed to stand for completion of the reaction to obtain a photosensitive resin.

[0013] (2) Preparation of shadowless adhesive:

[0014] a) placing polyurethane acrylate, monomer diluent and photoinitiator in a stirring kettle, stirring and mixing until all components are uniformly mixed, and controlling the stirring speed to a medium-low speed to avoid the generation of bubbles;

[0015] b) After the stirring is completed, the mixture is allowed to stand to allow it to react fully, and after the reaction is completed, a shadowless adhesive is obtained.

[0016] (3) Preparation of potting and filling glue:

[0017] Putting photosensitive resin and shadowless glue in a stirring kettle according to a certain mass ratio, mixing them evenly, and obtaining a potting and filling glue;

[0018] (4) Use thickener to increase the viscosity of potting filling glue:

[0019] Add a thickener to the potting filling glue obtained in step (3), and then stir evenly at a temperature of 25 to 28° C. until the thickener is evenly dispersed in the potting filling glue;

[0020] (5) Use anti-yellowing additives to improve the anti-yellowing properties of potting and filling glue:

[0021] Adding an anti-yellowing agent to the potting and filling glue obtained in step (4), and then stirring the mixture evenly at a temperature of 25 to 28° C. until the anti-yellowing agent is evenly dispersed in the potting and filling glue;

[0022] Preferably, in step (1), the mass fraction of epoxy acrylate is 20 to 60 parts, the mass fraction of polyurethane acrylate is 30 to 55 parts, the mass fraction of photoinitiator is 2 to 10 parts, the speed of the stirring kettle is 100 to 200 r / min, the stirring time is 15 to 20 min, and the reaction temperature is 25 to 28°C.

[0023] Preferably, in step (2), the mass fraction of polyurethane acrylate is 55-70 parts, the mass fraction of monomer diluent is 25-40 parts, the mass fraction of photoinitiator is 1-5 parts, the rotation speed of the stirring kettle is 70-100 r / min, the stirring time is 10-20 min, and the reaction temperature is 25-28°C.

[0024] Preferably, in steps (1) and (2), after the photoinitiator is added, the entire stirring process is carried out in a low-oxygen and light-proof environment, and nitrogen or other inert gases are used to replace the air in the stirring container.

[0025] Preferably, the photoinitiator comprises a metal organic framework-based photoinitiator, Irgacure-184, Irgacure-1173, TPO, or a mixture of several thereof, and a nanoscale photosensitizer (nano-TiO 2 and ZnO or a mixture of the two), the amount used is 1% to 5% of the total mass of the photoinitiator.

[0026] Preferably, in step (3), the mass ratio of the photosensitive resin to the shadowless adhesive is 15-30 parts:70-85 parts, the reaction temperature is 25-28°C, and during the mixing process of the shadowless adhesive and the photosensitive resin, the agitator is stirred at a speed of 100-200 r / min for 5-20 minutes to ensure that the two components are thoroughly mixed and prevent the formation of bubbles, thereby improving the overall quality and appearance of the repaired material.

[0027] Preferably, the thickener is at least one of sodium carboxymethyl cellulose and organic bentonite. The mass fraction of sodium carboxymethyl cellulose type I is 0.5 to 20 parts, the stirrer speed is 100 to 150 r / min, and the stirring time is 10 to 20 minutes; the mass fraction of organic bentonite is 0.5 to 5 parts, the stirrer speed is 120 to 200 r / min, and the stirring time is 10 to 20 minutes.

[0028] Preferably, the anti-yellowing additive is at least one of light stabilizer 292, 2,6-di-tert-butyl-p-cresol and nano titanium dioxide. The mass fraction of light stabilizer 292 is 0.2-1 part, the speed of the stirrer is 100-150 r / min, and the stirring time is 8-15 min; the mass fraction of 2,6-di-tert-butyl-p-cresol is 0.1-0.5 part, the speed of the stirrer is 100-150 r / min, and the stirring time is 5-10 min; the mass fraction of nano titanium dioxide is 0.03-0.12 part, the speed of the stirrer is 100-150 r / min, and the stirring time is 5-10 min.

[0029] Preferably, the stirring equipment is a closed stirring equipment to prevent potential contamination of the material and loss of volatile components during the stirring process, while protecting the working environment. The stirring equipment used is equipped with a scraper stirrer to minimize the colloid residue on the inner wall of the container to ensure comprehensive mixing and dispersion. When there are many bubbles after the stirring is completed, vacuum degassing can be performed.

[0030] Preferably, in the curing step, the wavelength of the ultraviolet lamp is 365-395 nm, and the curing time is 4-15 s.

[0031] The present invention discloses an application of a fast-curing potting and filling adhesive. The potting and filling adhesive obtained by the above-mentioned preparation method is applied to the defects of a resin product for repairing. The method comprises the steps of: applying the obtained potting and filling adhesive to the defects of the resin product, irradiating the defects with a light source of 365 to 395 nm wavelength for 5 to 20 seconds, and curing the potting and filling adhesive at the defects.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The potting and filling glue of the present invention has a stronger adhesive force during the repair process of resin products by optimizing the formula, and can effectively repair cracks and defects with high strength requirements, ensuring the structural stability and durability after repair.

[0034] (2) Compared with traditional UV glue, the potting and filling glue of the present invention can complete the curing process more quickly under ultraviolet light, greatly shortening the repair time and improving the repair efficiency. It is particularly suitable for time-sensitive repair operations in industrial production.

[0035] (3) The combined use of the photoinitiator and the nano-enhancer of the present invention not only improves the efficiency of photocuring, but also enhances the UV resistance and mechanical strength of the product due to its unique ultraviolet light scattering and absorption characteristics, which is very important for applications that require long-term exposure. It achieves faster curing speed and better weather resistance of the photosensitive resin, providing significant technical effects beyond the existing technology.

[0036] (4) The potting and filling glue of the present invention can reduce the fluidity of the potting and filling glue by adjusting the viscosity, so that it is not easy to flow when applied on a vertical or inclined surface, so that it can be kept at the application point without dripping or uneven application; for occasions where small defects or complex geometric structures need to be accurately filled, the potting and filling glue with higher viscosity can be more accurately positioned in a specific area, avoiding positional displacement during the curing process, ensuring the quality of the repair, and reducing material waste.

[0037] (5) The potting and filling adhesive of the present invention can maintain the original color and appearance of the potting and filling adhesive and its repaired object through a special antioxidant and light stabilizer formula, avoid yellowing and discoloration of the repaired area with the increase of usage time, and improve the appearance quality after repair; by slowing down the yellowing process, the effective service life of the material can be extended, especially in an environment exposed to ultraviolet rays or other light sources.

[0038] (6) The potting and filling glue of the present invention does not require heating, mixing or complex environmental requirements. It can complete the repair by simply applying and UV irradiation. It is suitable for a variety of repair scenarios and is simple and efficient to operate.

[0039] (7) The potting and filling adhesive of the present invention can be widely used in the repair of various resin products, and is suitable for multiple fields such as electronic components, automobile parts, and handicrafts, and has good versatility and stability.

[0040] (8) The potting and filling adhesive of the present invention exhibits better mechanical properties after curing, such as enhanced compression resistance, tensile resistance and impact resistance, and is suitable for applications that bear higher mechanical loads.

[0041] (9) The improved formula improves the bonding compatibility of the potting filler with a variety of materials, increases the bonding strength, and ensures long-term stable connection.

[0042] (10) The potting and filling glue of the present invention uses environmentally friendly thickeners and stabilizers to reduce harmful substances that may be released during the curing process, which is more in line with environmental protection standards. By strictly controlling the safety and purity of raw materials, it can be used in fields with higher safety requirements, such as food contact and medical equipment repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the present invention. For ordinary technicians in this field, all other embodiments obtained without creative work should fall within the scope of protection of the present invention.

[0044] Figure 1 This is a real picture of the potting filling glue of the present invention;

[0045] Figure 2 The preparation process flow chart of the potting filling glue of the present invention is

[0046] Figure 3 The shadowless adhesive and photosensitive resin prepared by the present invention;

[0047] Figure 4 The viscosity comparison of the potting filling glue of the present invention before and after being modified with type I sodium carboxymethyl cellulose;

[0048] Figure 5 The potting and filling glue of the present invention is used to repair the broken 3D printing resin strip, which is placed under a UV lamp for light curing;

[0049] Figure 6 The yellowing defect of the potting and filling glue of the present invention is improved by using nano titanium dioxide, wherein the mass fractions of the nano titanium dioxide from left to right are 0.03 parts, 0.06 parts, 0.09 parts and 0.12 parts respectively. DETAILED DESCRIPTION

[0050] The present invention provides a method for preparing a potting and filling glue, comprising the following steps:

[0051] (1) Preparation of photosensitive resin:

[0052] a) placing epoxy acrylate and polyurethane acrylate in a stirring kettle at a speed of 100 to 200 r / min, stirring for 15 to 20 minutes, and fully mixing, wherein the mass fraction of epoxy acrylate is 20 to 60 parts, and the mass fraction of polyurethane acrylate is 30 to 55 parts;

[0053] b) adding a photoinitiator to the mixture of step a), wherein the mass fraction of the photoinitiator is 2 to 10 parts;

[0054] c) stirring the mixture of step b) in a light-proof environment until it is uniform, ensuring that the photoinitiator is fully dissolved;

[0055] d) After stirring evenly, the mixture is allowed to stand for completion of the reaction to obtain a photosensitive resin.

[0056] (2) Preparation of shadowless adhesive:

[0057] a) placing polyurethane acrylate, monomer diluent and photoinitiator in a stirring kettle at a speed of 70-100 r / min and stirring for 10-20 min, wherein the mass fraction of polyurethane acrylate is 55-70 parts, the mass fraction of monomer diluent is 25-40 parts, and the mass fraction of photoinitiator is 1-5 parts;

[0058] b) stirring the mixture of step a) in a light-proof condition until all components are uniformly mixed, and controlling the stirring speed to a medium-low speed to avoid the generation of bubbles;

[0059] c) After the stirring is completed, the mixture is allowed to stand to allow it to react fully, and after the reaction is completed, a shadowless adhesive is obtained.

[0060] (3) Preparation of potting and filling glue:

[0061] At 25-28°C, the shadowless glue and the photosensitive resin are mixed in a certain mass ratio to prepare a potting and filling glue, and then the potting and filling glue with different proportions is used to repair the 3D printed material, and it is placed under a 365-395nm ultraviolet lamp for light curing, and the curing time is 4-20s.

[0062] (4) Use thickener to increase the viscosity of potting filling glue:

[0063] Add a thickener to the potting filling glue obtained in step (3), and then stir evenly at a temperature of 25 to 28° C. until the thickener is evenly dispersed in the potting filling glue;

[0064] (5) Use anti-yellowing additives to improve the anti-yellowing properties of potting and filling glue:

[0065] Adding an anti-yellowing agent to the potting and filling glue obtained in step (4), and then stirring the mixture evenly at a temperature of 25 to 28° C. until the anti-yellowing agent is evenly dispersed in the potting and filling glue;

[0066] In the present invention, in the step (3), the mass ratio of the photosensitive resin to the shadowless adhesive is preferably 15-30 parts:70-85 parts.

[0067] In the present invention, the standing time of the shadowless adhesive and the photosensitive resin is 2 to 5 minutes.

[0068] In the present invention, the photosensitive resin and the shadowless adhesive are mixed under stirring conditions, with a rotation speed of 100 to 200 r / min, and the stirring time is preferably 5 to 20 min, and further optimized to 5 to 10 min.

[0069] In the present invention, the thickener includes at least one of carboxymethyl cellulose and organic bentonite.

[0070] In the present invention, the mass fraction of sodium carboxymethylcellulose type I is 10 to 20 parts, more preferably 15 to 18 parts.

[0071] In the present invention, the mass fraction of the organic bentonite is 1 to 5 parts, more preferably 3 to 5 parts.

[0072] In the present invention, the anti-yellowing modification is achieved by adding at least one of light stabilizer 292, 2,6-di-tert-butyl-p-cresol, and nano titanium dioxide.

[0073] In the present invention, the mass fraction of the light stabilizer 292 is 0.2 to 1 part, and more preferably 0.2 to 0.4 part.

[0074] In the present invention, the preferred mass fraction of 2,6-di-tert-butyl-p-cresol is 0.1 to 0.5 parts, and more preferably 0.3 to 0.5 parts. The 2,6-di-tert-butyl-p-cresol is pre-mixed in a small amount of potting and filling glue in powder form to form a concentrated mixture, and then the concentrated mixture is added to the remaining potting and filling glue to optimize the dispersibility and mixing uniformity of 2,6-di-tert-butyl-p-cresol and reduce agglomeration during the addition process.

[0075] In the present invention, the mass fraction of nano titanium dioxide is 0.03 to 0.12 parts, and more preferably 0.09 to 0.12 parts. The nano titanium dioxide is pre-mixed in a small amount of potting and filling glue in powder form to form a concentrated mixture, and then the concentrated mixture is added to the remaining potting and filling glue to optimize the dispersibility and mixing uniformity of the nano titanium dioxide and reduce the agglomeration phenomenon during the addition process. The speed of the stirrer is 100 to 150 r / min, and the stirring time is 5 to 10 minutes.

[0076] In the present invention, the stirring device is a closed stirring device to prevent potential contamination of the material and loss of volatile components during the stirring process, while protecting the working environment. The stirring device used is equipped with a scraper stirrer to minimize the colloid residue on the inner wall of the container to ensure comprehensive mixing and dispersion. When there are many bubbles after the stirring is completed, vacuum degassing can be performed.

[0077] The technical solution provided by the present invention is described in detail below in conjunction with the embodiments, but they should not be understood as limiting the protection scope of the present invention.

[0078] (1) Improve the viscosity of the potting filling glue

[0079] Example 1

[0080] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were placed in a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 0.40 g of sodium carboxymethyl cellulose type I was added to the premix, and the mixture was stirred for 8 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0081] Example 2

[0082] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were placed in a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 0.80 g of sodium carboxymethyl cellulose type I was added to the premix, and the mixture was stirred for 8 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0083] Example 3

[0084] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were placed in a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 1.60 g of sodium carboxymethyl cellulose type I was added to the premix, and the mixture was stirred for 8 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0085] Example 4

[0086] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were placed in a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 2.40 g of sodium carboxymethyl cellulose type I was added to the premix, and the mixture was stirred for 8 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0087] Example 5

[0088] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were placed in a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 3.20 g of sodium carboxymethyl cellulose type I was added to the premix, and the mixture was stirred for 8 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0089] Example 6

[0090] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were placed in a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 4.00 g of sodium carboxymethyl cellulose type I was added to the premix, and the mixture was stirred for 8 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0091] Example 7

[0092] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were placed in a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 12.00 g of sodium carboxymethyl cellulose type I was added to the premix, and the mixture was stirred for 12 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0093] Example 8

[0094] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were placed in a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 16.00 g of sodium carboxymethyl cellulose type I was added to the premix, and the mixture was stirred for 12 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0095] The mixed glue prepared in Examples 1-8 was tested for the light curing time of 3D printing material repair.

[0096] Determination of light curing time for repair: First, apply the mixed glue to the material to be repaired. Then, place it under a UV lamp with a wavelength of 365nm and record the required curing time.

[0097] The specific test results are shown in Table 1

[0098] Table 1 Test results of photocuring time of mixed hydrogels prepared in Examples 1-8

[0099]

[0100]

[0101] It can be seen from the above embodiments that the present invention provides a potting and filling glue, which has appropriate viscosity when the sodium carboxymethyl cellulose is 15 parts, and its light curing time is within 5 seconds, and the material has good performance after the glue is applied and light cured.

[0102] (2) Improve the yellowing performance of potting and filling glue

[0103] On the basis of (1), the yellowing performance of the potting filling glue is improved.

[0104] Example 1

[0105] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were put into a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 12.00 g of sodium carboxymethyl cellulose type I and 0.015 g of nano titanium dioxide were added to the premix, and the mixture was stirred for 12 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0106] Example 2

[0107] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were put into a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 12.00 g of sodium carboxymethyl cellulose type I and 0.030 g of nano titanium dioxide were added to the premix, and the mixture was stirred for 12 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0108] Example 3

[0109] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were put into a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 12.00 g of sodium carboxymethyl cellulose type I and 0.045 g of nano titanium dioxide were added to the premix, and the mixture was stirred for 12 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0110] Example 4

[0111] At 26°C, 10 mL of photosensitive resin and 40 mL of shadowless glue were put into a stirring kettle at a speed of 100 r / min and stirred for 10 minutes to obtain a premix. Then, 12.00 g of sodium carboxymethyl cellulose type I and 0.060 g of nano titanium dioxide were added to the premix, and the mixture was stirred for 12 minutes and allowed to stand for 2 minutes to obtain a potting and filling glue.

[0112] The potting and filling glue prepared in Examples 1-4 was tested for yellowing.

[0113] Determination of yellowing performance: Place the prepared potting and filling glue for ten days, observe its yellowing, and take photos of the potting and filling glue after ten days. Figure 5

[0114] It can be seen from the above embodiments that the present invention provides a potting and filling glue, which has less yellowing after ten days when the amount of nano titanium dioxide used is 0.09 to 0.12 parts, and its light curing time is within 5 seconds. After the glue is applied and light cured, the material has good performance.

[0115] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a fast-curing potting and filling glue for repairing resin products, characterized in that: The following steps are involved: (1) Preparation of photosensitive resin: a) placing epoxy acrylate and polyurethane acrylate in a stirring tank and mixing them thoroughly; b) adding a photoinitiator to the mixture of step a), stirring until uniform, and ensuring that the photoinitiator is fully dissolved; c) after stirring evenly, standing to allow the reaction to complete, thereby obtaining a photosensitive resin; (2) Preparation of shadowless adhesive: a) placing polyurethane acrylate, monomer diluent and photoinitiator in a stirring kettle, stirring and mixing until all components are uniformly mixed, and controlling the stirring speed to a medium-low speed to avoid the generation of bubbles; b) After the stirring is completed, the mixture is allowed to stand to allow it to react fully, and after the reaction is completed, a shadowless adhesive is obtained. (3) Preparation of potting and filling glue: Putting photosensitive resin and shadowless glue in a stirring kettle according to a certain mass ratio, mixing them evenly, and obtaining a potting and filling glue; (4) Use thickener to increase the viscosity of potting filling glue: Add a thickener to the potting filling glue obtained in step (3), and then stir evenly at a temperature of 25 to 28° C. until the thickener is evenly dispersed in the potting filling glue; (5) Use anti-yellowing additives to improve the anti-yellowing properties of potting and filling glue: An anti-yellowing agent is added to the potting and filling glue obtained in step (4), and then the mixture is stirred evenly at a temperature of 25 to 28° C. until the anti-yellowing agent is evenly dispersed in the potting and filling glue.

2. The preparation method according to claim 1, characterized in that: In the step (1), the mass fraction of epoxy acrylate is 20 to 60 parts, the mass fraction of polyurethane acrylate is 30 to 55 parts, the mass fraction of photoinitiator is 2 to 10 parts, the rotation speed of the stirring kettle is 100 to 200 r / min, the stirring time is 15 to 20 min, and the reaction temperature is 25 to 28°C.

3. The preparation method according to claim 1, characterized in that: In the step (2), the mass fraction of polyurethane acrylate is 55-70 parts, the mass fraction of monomer diluent is 25-40 parts, the mass fraction of photoinitiator is 1-5 parts, the rotation speed of the stirring kettle is 70-100 r / min, the stirring time is 10-20 min, and the reaction temperature is 25-28°C.

4. The preparation method according to claim 1, characterized in that: In the steps (1) and (2), after the photoinitiator is added, the entire stirring process is carried out in a low-oxygen and light-proof environment, and nitrogen or other inert gases are used to replace the air in the stirring container.

5. The preparation method according to claim 1, characterized in that: The photoinitiator includes a metal organic framework-based photoinitiator, Irgacure-184, Irgacure-1173, TPO or a mixture of several thereof, and a nano-scale photosensitizer (a mixture of one or two of nano-TiO2 and ZnO) is added, and the amount used is 1% to 5% of the total mass of the photoinitiator.

6. The preparation method according to claim 1, characterized in that: In the step (3), the mass ratio of the photosensitive resin to the shadowless adhesive is 15-30 parts:70-85 parts, and the reaction temperature is 25-28°C. During the mixing process of the shadowless adhesive and the photosensitive resin, the stirrer stirs at a speed of 100-200 r / min for 5-20 minutes to ensure that the two components are thoroughly mixed and prevent the formation of bubbles, thereby improving the overall quality and appearance of the repaired material.

7. The preparation method according to claim 1, characterized in that: In step (4), the thickener includes at least one of sodium carboxymethyl cellulose type I and organic bentonite. The mass fraction of sodium carboxymethyl cellulose type I is 0.5 to 20 parts, and different amounts of sodium carboxymethyl cellulose type I are added to obtain potting and filling glues with different viscosities to meet different repair requirements. The stirrer speed is 100 to 150 r / min and the stirring time is 10 to 20 minutes. The mass fraction of organic bentonite is 0.5 to 5 parts, and different amounts of organic bentonite are added to obtain potting and filling glues with different viscosities to meet different repair requirements. The stirrer speed is 120 to 200 r / min and the stirring time is 10 to 20 minutes.

8. The preparation method according to claim 1, characterized in that: In step (5), the anti-yellowing aid includes at least one of light stabilizer 292, 2,6-di-tert-butyl-p-cresol, and nano titanium dioxide. The mass fraction of light stabilizer 292 is 0.2 to 1 part, the speed of the stirrer is 100 to 150 r / min, and the stirring time is 8 to 15 min; the mass fraction of 2,6-di-tert-butyl-p-cresol is 0.1 to 0.5 parts, and the 2,6-di-tert-butyl-p-cresol is pre-mixed in a small amount of potting and filling glue in powder form to form a concentrated mixture, and then the concentrated mixture is added to the remaining potting and filling glue to optimize the dispersibility and mixing uniformity of 2,6-di-tert-butyl-p-cresol and reduce the agglomeration phenomenon during the addition process. The speed of the stirrer is 100-150 r / min, and the stirring time is 5-10 min. The mass fraction of nano titanium dioxide is 0.03-0.12 parts. The nano titanium dioxide is pre-mixed in a small amount of potting and filling glue in powder form to form a concentrated mixture, and then the concentrated mixture is added to the remaining potting and filling glue to optimize the dispersibility and mixing uniformity of the nano titanium dioxide and reduce agglomeration during the addition process. The speed of the stirrer is 100-150 r / min, and the stirring time is 5-10 min.

9. The preparation method according to claim 1, characterized in that: The stirring device is a closed stirring device to prevent potential contamination of the material and loss of volatile components during the stirring process, while protecting the working environment. The stirring device used is equipped with a scraper stirrer to minimize the colloid residue on the inner wall of the container to ensure comprehensive mixing and dispersion. When there are many bubbles after the stirring is completed, vacuum degassing can be performed.

10. The preparation method according to claim 1, characterized in that: In the curing step, the wavelength of the ultraviolet lamp is 365-395 nm, and the curing time is 4-15 s.

Images