Near-infrared cured composition with high filler ratio

Abstract

The invention relates to a near-infrared cured composition with a high filler ratio, in particular to near-infrared cured balance mud glue and a preparation method thereof. The balance mud glue is a single component, and has the characteristics of high specific gravity, high curing rate, high filler proportion and deep curing thickness. The near-infrared curing technology is utilized, the ratio of the resin to the filler can be flexibly adjusted, and a low-resin and high-filler ratio system can be rapidly cured. The prepared balance mud glue is wide in density interval and can be suitable for various different motor rotors; and the product is convenient to operate and use, and has excellent adhesive property and flexibility. A near-infrared curing mechanism is utilized, so that high-filler, large-area and deep-thickness (gt; and meanwhile, the construction time is shortened, and the construction steps are optimized.

Description

Technical Field

[0001] The present invention relates to a high filler content composition cured by near-infrared, and more specifically, to a near-infrared cured balancing putty. Background Art

[0002] Balancing putty, also known as specific gravity putty and dynamic balancing putty, can be cured quickly and is applied to various precision motor systems to assist the motor system in maintaining balance during high-speed operation.

[0003] There are two centers in the motor rotor, namely the mass center and the rotation center. In the completely ideal state of the design and manufacture of the motor rotor, the mass center coincides with the rotation center. During the high-speed rotation of the motor rotor, the centrifugal forces in all directions are balanced with each other, the motor is at the highest operating efficiency, and the noise and vibration are also at a relatively low level. However, due to limitations of raw materials, assembly errors, etc., there is often a certain deviation between the mass center and the rotation center of the motor rotor in the actual process. By adding a certain mass of balancing putty at a specific position of the motor rotor, the mass distribution of the motor rotor can be changed, thereby adjusting the position of the center of mass of the rotor to make it as close as possible to the rotation center. Balancing putty is usually viscous and elastic, which can not only adjust the mass distribution, but also absorb the vibration energy caused by the rotor imbalance, further reducing the impact of vibration on the motor rotor.

[0004] Balancing putty is mainly a mixed system of resin and filler. The density of the resin is usually around 1 g / cm 3 , and the density of the filler fluctuates within a relatively large range according to its own properties. In order to ensure complete curing of the balancing putty, the resin part often occupies a large proportion, which results in a generally low density of the balancing putty. The material of the motor rotor is copper. When the density of the balancing putty is low, a large amount of balancing putty is required to balance the center of gravity.

[0005] In the prior art, most are thermosetting balancing putties, which require several hours for complete curing, have complex operations, and are not conducive to automated production. The patent with publication number CN 108504043A uses AB-component epoxy resin to prepare a balancing putty with weather resistance, anti-shedding, and anti-fouling properties; the density of this balancing putty is 3.7 - 4.3 g / cm 3 , and the curing time is 5 - 5.5 h. The patent with publication number CN 116535139A uses organosilicon epoxy resin to prepare a heat-conducting and high-temperature-resistant balancing putty; the density of this balancing putty is 3.94 - 4.17 g / cm 3 , and the curing time is 4.8 - 5.5 h. In the above-mentioned thermosetting patents, the curing time of the balancing putty exceeds 5.5 h, and the density does not exceed 4.3 g / cm 3 .

[0006] The photo-curable balancing putty has the advantages of fast curing rate, convenient operation, etc. The patent with the publication number CN 116970365A prepared a highly weather-resistant ultraviolet deep-curing balancing putty using a modified organosilicon acrylate resin; the density of this balancing putty is 2.90 - 4.20 g / cm 3 , and the curing depth is 3.85 - 5.28 mm. The patent with the publication number CN117143558A prepared an ultraviolet-curing adhesive; the density of this balancing putty is 2.62 - 3.10 g / cm 3 , and the curing depth is 3.98 - 5.46 mm. The thickness of the above photo-curable balancing putty does not exceed 5.5 mm, and the density does not exceed 4.2 g / cm 3 .

[0007] The material of the motor rotor is mainly high-purity copper (density 8.96 g / cm 3 ), and currently the density of the balancing putty in most patents is relatively low (not exceeding 5 g / cm 3 ), which is quite different from the density of the motor rotor itself. When in use, a relatively large addition amount is often required to balance the center of gravity. On the one hand, a large amount of low-specific-gravity balancing putty will increase the usage difficulty; on the other hand, it will occupy a relatively large internal space of the motor, which is not conducive to the optimization of the motor volume.

[0008] Therefore, it is necessary to develop a new balancing putty composition to address the defects of long curing time, insufficient curing depth, and relatively low specific gravity in the existing technology. Summary of the Invention

[0009] Aiming at the deficiencies of the current technology, the present invention provides a near-infrared-curing balancing putty composition with a high filler content.

[0010] The present invention uses a near-infrared light curing mechanism. First, near-infrared light has high penetrability. After the upconversion material absorbs near-infrared light, it is converted into ultraviolet visible light, thereby exciting the photoinitiator to induce the polymerization of the photosensitive resin. Second, near-infrared light is an electromagnetic wave, which will cause molecular friction - collision and reciprocating motion during propagation, generating a thermal effect. Under the action of the thermal effect, it will promote the cross-linking and curing of the resin system, and only a small amount of resin is required to achieve rapid curing under the conditions of high filler content and deep thickness.

[0011] In the present invention, the resin content is low and the filler content is high. Therefore, the density adjustable range of the near-infrared-curing balancing putty is large. At the same time, the near-infrared curing system can adapt to various filler systems, such as ceramic powder, metal powder, metal oxide powder, non-metal oxide powder, etc. When adapting to the filler of a high thermal conductivity system, it will further enhance the heat transfer of the resin system and improve the reaction rate and conversion rate.

[0012] The first aspect of the present invention provides a high filler ratio balanced putty that is cured by near-infrared light, comprising the following components in parts by weight: matrix resin: 5 - 50 parts, reactive diluent: 0 - 20 parts, filler: 50 - 95 parts, photoinitiator: 1 - 6 parts, upconversion material: 0.5 - 4 parts, thixotropic agent: 1 - 6 parts, auxiliary agent: 1 - 5 parts;

[0013] Further preferably, the present invention provides a high filler ratio balanced putty that is cured by near-infrared light and heat synergy, comprising the following components in parts by weight: matrix resin: 5 - 50 parts, reactive diluent: 0 - 20 parts, filler: 50 - 95 parts, thermal initiator: 1 - 6 parts, upconversion material: 0.5 - 4 parts, thixotropic agent: 1 - 6 parts, auxiliary agent: 1 - 5 parts.

[0014] In a preferred embodiment of the present invention, by adding a thermal initiator to the near-infrared light curing system, a near-infrared light and heat synergy curing mechanism is formed. The thermal effect generated by the near-infrared light source and the upconversion particles can promote the cleavage of the thermal initiator without heating, generating highly active free radicals, which can further accelerate the polymerization reaction between the resins, making the resin system have an extremely high double bond conversion rate. Compared with the near-infrared light curing mechanism, the near-infrared light and heat synergy curing mechanism requires less resin, has a faster rate, and a higher resin double bond conversion rate.

[0015] Further, the matrix resin is a multi-functional acrylate oligomer containing 2 or more acrylate functional groups.

[0016] More preferably, the multi-functional acrylate oligomer is selected from multi-functional epoxy acrylate, multi-functional polyurethane acrylate, multi-functional polyester acrylate, and multi-functional polyether acrylate.

[0017] In some preferred embodiments, the matrix resin is one or more mixtures of 6126, 6147, 6145 - 100, 6146 - 100, 6196 - 100, 6261, 6311 - 100 of Changxing Materials Industry Co., Ltd., and RY1101, RY1102, RY2232, RY2250, RY2252 of Ruiyang Chemical Co., Ltd.

[0018] Further, the reactive diluent contains 1 or more acrylate groups in its structure; and has a molecular weight less than 1000 g / mol and a viscosity less than 500 cps (at 25 °C);

[0019] In some preferred embodiments, the reactive diluent is selected from one or a combination of stearyl acrylate (SA), isobornyl methacrylate (IBOA), benzyl acrylate, tetrahydrofurfuryl methacrylate (THFA), 1,6 - hexanediol diacrylate (HDDA), 1,4 - butanediol diacrylate (BDDA), pentaerythritol triacrylate (PETA), trimethylolpropane triacrylate (TMPTA), trimethylolpropane triacrylate tricyclopropoxide, pentaerythritol tetraacrylate (PETEA), ditrimethylolpropane tetraacrylate (DTMPTA), dipentaerythritol hexaacrylate (DPHA).

[0020] In some preferred embodiments, the high - filler - ratio balanced putty cured by near - infrared light comprises the following components in parts by weight: matrix resin: 8 - 30 parts, reactive diluent: 1 - 5 parts, filler: 65 - 95 parts, photoinitiator: 1 - 4 parts, up - conversion material: 0.5 - 3 parts, thixotropic agent: 1 - 3 parts, auxiliary agent: 1 - 3 parts.

[0021] In some preferred embodiments, the high - filler - ratio balanced putty cured by near - infrared light and heat synergistically comprises the following components in parts by weight: matrix resin: 8 - 30 parts, reactive diluent: 1 - 5 parts, filler: 65 - 95 parts, photoinitiator: 1 - 4 parts, thermal initiator: 1 - 4 parts, up - conversion material: 0.5 - 3 parts, thixotropic agent: 1 - 3 parts, auxiliary agent: 1 - 3 parts.

[0022] Furthermore, the filler is selected from one or a combination of ceramic powder, metal powder, metal oxide powder, and inorganic non - metal powder. Further illustration, the ceramic powder includes but is not limited to alumina, zirconia, zinc oxide, barium titanate, aluminum titanate, boron nitride, aluminum nitride, silicon nitride, silicon carbide; the metal powder includes but is not limited to: tungsten powder, magnesium powder, silver powder, tin powder, nickel powder, iron powder, copper powder, aluminum alloy powder; the metal oxide powder includes but is not limited to: magnesium oxide powder, calcium oxide powder, copper oxide powder, alumina powder, titanium oxide; the inorganic non - metal powder includes but is not limited to: silica, mica powder, graphite powder, kaolin powder.

[0023] In some embodiments, the filler uses a high - thermal - conductivity filler or a mixed filler including the high - thermal - conductivity filler; in some embodiments, the high - thermal - conductivity filler is a metal powder or a metal oxide powder. In some preferred embodiments, the filler is a mixture formed by a metal powder and a first filler; the first filler is selected from the ceramic powder, metal oxide powder, and inorganic non - metal powder. In some embodiments, the mass ratio of the metal powder to the first filler is 1∶2 - 2∶1.

[0024] The thermal effect generated by the near-infrared light source irradiation and the upconversion particles acts on the high-thermal-conductivity filler to accelerate the heat transfer of the system, further promoting the crosslinking and curing of the system and achieving a better curing effect.

[0025] In some more preferred embodiments, a filler of high-conductivity metal is used. Compared with the mixed filler system, its curing rate is faster and the resin conversion efficiency is higher.

[0026] In some embodiments, the filler is a mixture formed by ceramic powder and a second filler; the second filler is selected from metal powder, metal oxide powder, and inorganic non-metal powder.

[0027] Furthermore, the photoinitiator is a free radical initiator. In some embodiments, the photoinitiator is selected from one or a combination of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (819), diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), bis(2,6-difluoro-3-pyrrolophenyl)titanocene (784), and benzophenone (BP).

[0028] In some preferred embodiments, the photoinitiator is a compound photoinitiator composed of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (819) and bis(2,6-difluoro-3-pyrrolophenyl)titanocene (784).

[0029] Furthermore, the thermal initiator is a free radical initiator. In some embodiments, the thermal initiator is selected from one or a combination of benzoyl peroxide (BPO), di-tert-butyl peroxide (DTBP), methyl ethyl ketone peroxide (MEKP), azobisisobutyronitrile (AIBN), and azodiisooctanenitrile (ABVN).

[0030] In some preferred embodiments, the thermal initiator is a compound thermal initiator composed of azobisisobutyronitrile (AIBN) and azodiisooctanenitrile (ABVN).

[0031] Furthermore, the upconversion material is selected from one or a combination of NaYF4, BaYF5, NaGdF4, LiYF4, NaYbF4, Na3ScF6, YF3, and GdOF; in some preferred embodiments, NaYF4 is used as the upconversion material.

[0032] Furthermore, the thixotropic agent is selected from one or a combination of fumed silica, hydrogenated castor oil, organobentonite, and polyamide wax.

[0033] Furthermore, the additives include: silane coupling agent, adhesion promoter, antioxidant, and dispersant.

[0034] In some embodiments of the present invention, the additives include silane coupling agents and dispersants; further, the silane coupling agent is selected from one or a combination of KH 550, KH 560, and KH 570; further, the dispersant is selected from one or a combination of BYK-4310 and BYK 110.

[0035] Further, the specific gravity of the balanced mud gum can reach 2 - 9 g / cm 3 , and more preferably the specific gravity is 6 - 9 g / cm 3 .

[0036] In some embodiments of the present invention, the specific gravity of the balanced mud gum is 2.75 - 8.93 g / cm 3 .

[0037] In some embodiments of the present invention, the curing depth of the balanced mud gum is ≥8 mm. In some preferred embodiments, the curing depth is ≥10 mm.

[0038] Another aspect of the present invention is to provide a method for preparing the near-infrared-cured high-filler-content balanced mud gum, and the specific steps are as follows: S1. Put the main resin, active diluent, and filler into a planetary disperser and disperse them evenly under vacuum and light-shielded conditions; S2. Continuously add the initiator, upconversion particles, thixotropic agent, and additives, and continue to disperse under vacuum and light-shielded conditions. After the composition is mixed evenly, take it out and package it in a light-shielded and airtight manner for later use.

[0039] In some embodiments, in step S1, the stirring time is 10 - 40 min; in some embodiments, in step S2, the stirring time is 10 - 40 min.

[0040] In one embodiment of the present invention, the steps of the method for preparing the balanced mud gum are as follows: Put the main resin, active diluent, and filler into a planetary disperser and disperse and stir for 30 min under vacuum and light-shielded conditions; then put the initiator, upconversion particles, thixotropic agent, and additives into the planetary disperser and disperse and stir for 30 min under vacuum and light-shielded conditions; after mixing evenly, take it out and package it in a light-shielded and airtight manner for later use.

[0041] Another aspect of the present invention is to provide a method for using the near-infrared-cured high-filler-content balanced mud gum, and the steps are as follows: Take the balanced mud gum and apply it to the part to be used, and then cure it with a near-infrared light source.

[0042] Further, the near-infrared light source is a light source with a wavelength of 780 nm - 2000 nm. In some embodiments, the curing time is 0 - 10 seconds.

[0043] The curing method of the balance putty of the present invention uses upconversion particles of lanthanide rare earth elements as a medium. Through irradiation with a near-infrared light source, the near-infrared light at 980 nm is converted into ultraviolet short-wavelength light. The photoinitiator in the system absorbs the ultraviolet light and cleaves to form active free radicals, which promote the cross-linking polymerization reaction of the resin and the active diluent. Only a small amount of resin is needed to completely cure the balance putty in a short time.

[0044] Add a thermal initiator to the near-infrared light curing system. Due to the thermal effects of the near-infrared light and the upconversion particles, the action of the thermal initiator can be promoted, further promoting the cross-linking curing of the resin system, and complete curing can be achieved in a shorter time.

[0045] Advantages of the present invention

[0046] The present invention provides a balance putty with a high filler ratio cured by near-infrared light. Compared with the prior art:

[0047] (1) The balance putty of the present invention is a single component, which can be directly used according to requirements, is convenient and fast, has a short curing time, can improve the construction efficiency, and has excellent adhesion performance and flexibility; compared with the existing thermal curing technology, the curing speed is faster and the specific gravity is higher;

[0048] (2) The balance putty of the present invention can achieve deep curing in a short time, and the curing depth can reach 8-10 mm; it can cure the proportion putty with a high filler ratio system, large area, and thick depth; the scope of application is wider;

[0049] (3) The proportion of resin in the balance putty of the present invention is low (the filler ratio is high). By using the near-infrared light source and the upconversion particles to generate thermal effects, the curing cross-linking of the balance putty is further promoted, and only a small amount of resin is needed to completely cure the balance putty.

[0050] (4) For the balance putty of the present invention, a small amount of resin can completely cure the balance putty, so the product has the characteristics of high solid content and high specific gravity, and the density can reach: 2.75-8.93 g / cm 3 ; The single-component balance putty of the present invention can not only achieve different densities of the balance putty by adjusting the ratio of the main resin and the filler, but also achieve different densities by adjusting the type and combination of the fillers; synergistically achieve a wider density range; the specific gravity adjustment is convenient and the use scenario is wider. Description of the drawings

[0051] The drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application. In the drawings:

[0052] Figure 1Infrared test chart of the near-infrared light-curing system of Example 1;

[0053] Figure 2 Infrared test chart of the near-infrared light-thermal curing system of Example 11. Detailed implementation manners

[0054] To make the above objects, features and advantages of the present invention more obvious and understandable, the following describes in detail the specific implementation manners of the present invention in combination with the embodiments of the specification. Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the disclosed embodiments below.

[0055] The test methods are as follows:

[0056] Curing depth: Place the sample in a cube mold. After curing is completed, remove it from the mold and measure the thickness of the cured part of the adhesive layer with a vernier caliper.

[0057] Specific gravity (density): Use a specific gravity cup with a known volume. First, weigh the mass of the empty specific gravity cup, and then weigh the mass of the specific gravity cup filled with balanced mud glue, and measure the density by calculation.

[0058] Viscosity: Use a rheometer (model: Thermo Fisher - MARS60, rotor: P20)

[0059] Compressive strength: Use a universal material testing machine to apply pressure to a cylinder with a diameter of 50 mm and a height of 100 mm, so that the sample bears the pressure until it is damaged, and measure the maximum pressure that can be borne at the time of damage.

[0060] Resin conversion rate test: Use a Fourier transform attenuated total reflection infrared spectrometer to test the characterization of the resin before and after curing, and calculate the area of the double bond absorption peak.

[0061] Surface temperature: Use an infrared thermometer gun to test.

[0062] Table 1 Raw material ratios of each embodiment

[0063]

[0064] Preparation of a high filler ratio composition for near-infrared light curing in Example 1:

[0065] Put 28 parts of 6145-100, 2 parts of TMPTA, and 70 parts of alumina into a planetary disperser, heat up to 50 °C, and disperse and stir for 30 min under vacuum and light avoidance conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 550, and 1 part of dispersant BYK 110 into a reaction kettle at 50 °C, and disperse and stir for 30 min under vacuum and light avoidance conditions. After the dispersion is completed, take it out and store it in a light-avoiding and airtight package for later use.

[0066] When in use, take out a certain amount of balancing putty, coat it on the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0067] Preparation of a high filler ratio composition cured by near-infrared light in Example 2:

[0068] Put 25 parts of RY2250, 5 parts of HDDA, and 70 parts of zirconia into a planetary disperser, heat up to 50 °C, and disperse and stir for 30 min under vacuum and light avoidance conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 570, and 1 part of dispersant BYK 110 into a reaction kettle at 50 °C, and disperse and stir for 30 min under vacuum and light avoidance conditions. After the dispersion is completed, take it out and store it in a light-avoiding and airtight package for later use.

[0069] When in use, take out a certain amount of balancing putty, coat it on the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0070] Preparation of a high filler ratio composition cured by near-infrared light in Example 3:

[0071] Put 15 parts of 6145-100, 3 parts of TMPTA, and 82 parts of barium titanate into a planetary disperser, heat up to 55 °C, and disperse and stir for 40 min under vacuum and light avoidance conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, 1 part of fumed silica, 1 part of silane coupling agent KH 550, and 1 part of dispersant BYK 110 into a reaction kettle at 55 °C, and disperse and stir for 40 min under vacuum and light avoidance conditions. After the dispersion is completed, take it out and store it in a light-avoiding and airtight package for later use.

[0072] When in use, take out a certain amount of balancing putty, coat it on the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0073] Preparation of a high filler ratio composition cured by near-infrared light in Example 4:

[0074] Sequentially put 21 parts of 6145-100, 4 parts of TMPTA, 50 parts of zirconia, and 25 parts of copper powder into a planetary disperser, heat up to 55 °C, and disperse and stir for 40 min under vacuum and light avoidance conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 550, and 1 part of dispersant BYK 110 into a reaction kettle at 55 °C, and disperse and stir for 40 min under vacuum and light avoidance conditions. After the dispersion is completed, take it out and package it in a light-avoiding and airtight manner for standby.

[0075] When in use, take out a certain amount of balancing putty, apply it to the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0076] Preparation of a high filler ratio composition cured by near-infrared light in Example 5:

[0077] Sequentially put 17 parts of 6146-100, 3 parts of DPHA, 30 parts of barium titanate, and 25 parts of nickel powder into a planetary disperser, heat up to 55 °C, and disperse and stir for 40 min under vacuum and light avoidance conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 560, and 1 part of dispersant BYK 110 into a reaction kettle at 55 °C, and disperse and stir for 40 min under vacuum and light avoidance conditions. After the dispersion is completed, take it out and package it in a light-avoiding and airtight manner for standby.

[0078] When in use, take out a certain amount of balancing putty, apply it to the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0079] Preparation of a high filler ratio composition cured by near-infrared light in Example 6:

[0080] Sequentially put 17 parts of 6145-100, 3 parts of HDDA, 22 parts of zirconia, and 60 parts of copper powder into a planetary disperser, heat up to 55 °C, and disperse and stir for 40 min under vacuum and light avoidance conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 550, and 1 part of dispersant BYK 110 into a reaction kettle at 55 °C, and disperse and stir for 40 min under vacuum and light avoidance conditions. After the dispersion is completed, take it out and package it in a light-avoiding and airtight manner for standby.

[0081] When in use, take out a certain amount of balancing putty, apply it to the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0082] Preparation of a high filler ratio composition cured by near-infrared light in Example 7:

[0083] Put 16 parts of RY2250, 4 parts of HDDA, and 80 parts of copper powder into a planetary disperser in sequence, heat up to 55 °C, and disperse and stir for 40 min under vacuum and light-shielding conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 570, and 1 part of dispersant BYK 110 into a reaction kettle at 55 °C, and disperse and stir for 40 min under vacuum and light-shielding conditions. After the dispersion is completed, take it out and package it in a light-shielded and airtight manner for standby.

[0084] When in use, take out a certain amount of balancing putty, coat it on the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0085] Preparation of a high filler content composition cured by near-infrared light in Example 8:

[0086] Put 28 parts of 6145 - 100, 2 parts of TMPTA, 40 parts of alumina, and 30 parts of copper powder into a planetary disperser in sequence, heat up to 50 °C, and disperse and stir for 30 min under vacuum and light-shielding conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 570, and 1 part of dispersant BYK 110 into a reaction kettle at 50 °C, and disperse and stir for 30 min under vacuum and light-shielding conditions. After the dispersion is completed, take it out and package it in a light-shielded and airtight manner for standby.

[0087] When in use, take out a certain amount of balancing putty, coat it on the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0088] Preparation of a high filler content composition cured by near-infrared light in Example 9:

[0089] Put 28 parts of 6145 - 100, 2 parts of TMPTA, 40 parts of alumina, and 30 parts of tungsten powder into a planetary disperser in sequence, heat up to 50 °C, and disperse and stir for 30 min under vacuum and light-shielding conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 570, and 1 part of dispersant BYK 110 into a reaction kettle at 50 °C, and disperse and stir for 30 min under vacuum and light-shielding conditions. After the dispersion is completed, take it out and package it in a light-shielded and airtight manner for standby.

[0090] When in use, take out a certain amount of balancing putty, coat it on the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0091] Preparation of a high filler content composition cured by near-infrared light: Example 10

[0092] Sequentially put 28 parts of 6145-100, 2 parts of TMPTA, and 70 parts of copper powder into a planetary disperser, heat up to 50 °C, and disperse and stir for 30 min under vacuum and light-shielded conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 560, and 1 part of dispersant BYK 110 into a reaction kettle at 50 °C, and disperse and stir for 30 min under vacuum and light-shielded conditions. After the dispersion is completed, take it out and store it in a light-shielded and airtight package for later use.

[0093] When in use, take out a certain amount of balancing putty, coat it on the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0094] Preparation of a high filler content composition cured by near-infrared light and heat: Example 11

[0095] Sequentially put 28 parts of 6145-100, 2 parts of TMPTA, and 70 parts of alumina into a planetary disperser, heat up to 50 °C, and disperse and stir for 30 min under vacuum and light-shielded conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator -784, 1 part of thermal initiator: AIBN, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 550, and 1 part of dispersant BYK 110 into a reaction kettle at 50 °C, and disperse and stir for 30 min under vacuum and light-shielded conditions. After the dispersion is completed, take it out and store it in a light-shielded and airtight package for later use.

[0096] When in use, take out a certain amount of balancing putty, coat it on the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800 nm - 1050 nm).

[0097] Preparation of a high filler content composition cured by near-infrared light and heat: Example 12

[0098] Sequentially put 15 parts of 6145-100, 5 parts of TMPTA, 50 parts of alumina, and 30 parts of copper powder into a planetary disperser, heat up to 50 °C, and disperse and stir for 30 min under vacuum and light-shielded conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator -784, 1 part of thermal initiator: AIBN, 1 part of NaYF4, 1 part of fumed silica, 1 part of silane coupling agent KH 550, and 1 part of dispersant BYK 110 into a reaction kettle at 50 °C, and disperse and stir for 30 min under vacuum and light-shielded conditions. After the dispersion is completed, take it out and store it in a light-shielded and airtight package for later use.

[0099] When in use, take out a certain amount of the balancing putty glue, apply it to the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800nm - 1050nm).

[0100] Example 13 Preparation of a high filler ratio composition with near-infrared light-heat synergistic curing:

[0101] Sequentially put 8 parts of RY2250, 2 parts of HDDA, and 90 parts of copper powder into a planetary disperser, heat up to 60°C, and disperse and stir for 50 min under vacuum and light-shielded conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, thermal initiator: 1 part of ABVN, 1 part of NaYF4, 1 part of aerosil, 1 part of silane coupling agent KH 570, and 1 part of dispersant BYK 110 into a reaction kettle at 60°C, and disperse and stir for 50 min under vacuum and light-shielded conditions. After the dispersion is completed, take it out and package it in a light-shielded and airtight manner for standby.

[0102] When in use, take out a certain amount of the balancing putty glue, apply it to the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800nm - 1050nm).

[0103] Example 14 Preparation of a high filler ratio composition with near-infrared light-heat synergistic curing:

[0104] Sequentially put 17 parts of RY2250, 3 parts of HDDA, 40 parts of alumina, and 40 parts of tungsten powder into a planetary disperser, heat up to 55°C, and disperse and stir for 40 min under vacuum and light-shielded conditions. Then put 1 part of photoinitiator 819, 2 parts of photoinitiator 784, thermal initiator: 1 part of ABVN, 1 part of NaYF4, 1 part of aerosil, 1 part of silane coupling agent KH 570, and 1 part of dispersant BYK 110 into a reaction kettle at 55°C, and disperse and stir for 40 min under vacuum and light-shielded conditions. After the dispersion is completed, take it out and package it in a light-shielded and airtight manner for standby.

[0105] When in use, take out a certain amount of the balancing putty glue, apply it to the position of the motor rotor that needs to be balanced, and then cure it with a near-infrared light source (800nm - 1050nm).

[0106] Comparative Example 1:

[0107] This comparative sample is compared with Example 1. It does not add upconversion particles and uses a UV light source for curing, and the other steps are the same.

[0108] Put 6145-100: 28 parts, TMPTA: 2 parts, and alumina: 70 parts into a planetary disperser, heat to 50°C, and disperse and stir for 30 minutes under vacuum and light-proof conditions. Then put photoinitiator 819: 1 part, photoinitiator 784: 2 parts, gas silicon: 1 part, silane coupling agent KH 550: 1 part, and dispersant BYK 110: 1 part into a 50°C reactor, and disperse and stir for 30 minutes under vacuum and light-proof conditions. After the dispersion is completed, take out the light-proof sealed package for standby use.

[0109] When using, take out a certain amount of balancing mud glue, apply it to the position where the motor rotor needs to be balanced, and then use a UV light source to cure it.

[0110] The data of Example 1 in patent CN 108504043 A was used.

[0111] Comparative Example 3:

[0112] The data of Example 1 in patent CN 116970365 A was used.

[0113] Comparative Example 4:

[0114] The data of Example 3 in patent CN 117143558 A was used.

[0115] Result analysis:

[0116] The performance test data of each embodiment and comparative example are shown in Table 2.

[0117] Table 2 Performance test of embodiments and comparative examples

[0118]

[0119]

[0120] From the data in Table 2, it can be seen that the density of the near-infrared light-cured balancing mud prepared by the present invention is 2.75-8.93 g / cm 3 , the curing depth can reach more than 8mm, and even exceed 10mm. The near-infrared light curing system (Examples 1 to 10) has a fast curing rate, and the curing time is less than 5 seconds; the near-infrared light-heat synergistic system (Examples 11 to 14) has a faster curing rate, and the curing time is less than 3 seconds. And the strength of the cured balance mud glue is high, which is equivalent to the compressive strength of the existing heat-curing balance mud glue. And the balance mud glue system of the present invention has a low viscosity and can be applied to the dispensing process in industrial production.

[0121] As can be seen from the data in Table 2, the specific gravity density of the heavy mud of the present invention is between 2.75 and 8.93, and the density coverage range is wide. The specific gravity of the system can be adjusted by adjusting the filler type for different application scenarios, and the applicable range is wide. This characteristic is attributed to the change of the specific gravity of the filler on the one hand and the high filler ratio of the system on the other hand. The adjustment of the filler type can directly affect the density of the system and achieve this effect synergistically. In a system with a low filler ratio, this effect cannot be achieved only by adjusting the filler type.

[0122] Table 3. Double bond conversion rate of near-infrared curing system

[0123]

[0124]

[0125] Such as Figure 1 、 Figure 2 and the data in Table 3 - the resin conversion rate data of the near-infrared curing system / near-infrared photothermal curing system of the present invention shows that: in a system with a high filler ratio, a high double bond conversion rate can be achieved in a short time. The double bond conversion rate (44.21%) of the near-infrared photothermal synergistic curing system (Example 11) with the same formulation is higher than that of the near-infrared light curing system (Example 1) (34.41%), indicating that the near-infrared photothermal coordinated curing system can further promote the reaction of the resin system and improve the conversion rate of the resin.

[0126] Table 4. Surface temperature during curing of near-infrared curing system

[0127]

[0128] As can be seen from the data in Table 4, the surface temperature during curing of the near-infrared curing system / near-infrared photothermal curing system of the present invention. In Examples 8 and 9, compared with Example 1, some dark fillers with endothermic effects were added, which intensified the heat transfer effect, so the temperature during curing was higher and the curing thickness was deeper; the filler in Example 10 was a highly thermally conductive metal filler, and compared with the mixed filler system, the temperature during curing was further increased and the curable thickness was further deepened.

[0129] Compared with Comparative Example 1, the embodiment of the present invention has a greater density and a deeper curing thickness. The curing depth of Comparative Example 1 is only 0.29 mm, which is due to the limited penetration of UV light, and the light source will be absorbed or scattered by the molecules in the balancing mud gum. As the depth increases, the light intensity decays exponentially. In a high filler system, this light attenuation is more obvious. Compared with Comparative Example 2, it has a greater density and a shorter curing time under the condition of comparable compressive strength; in addition, the process is simpler and does not require a two-component mixing step. Compared with Comparative Examples 3 / 4, the present invention has significant advantages in specific gravity and curing depth; the balancing mud gum has significant advantages in comprehensive performance.

[0130] The present invention provides a one-component, fast-curing, wide-density-range, and deeply-curable balancing mud gum and its preparation method. Compared with the prior art: the resin proportion in the balancing mud gum of the present invention is low (the filler proportion is high), and the density can be conveniently adjusted according to the application scenario; and the product is convenient to operate and use, and has excellent bonding performance and flexibility.

[0131] The balancing mud gum provided by the present invention uses a near-infrared light curing mechanism: First, near-infrared light has high penetrability and is converted into ultraviolet light with the assistance of upconversion particles, which can deeply cure the balancing mud gum. Second, the irradiation of the near-infrared light source and the thermal effect generated by the upconversion particles promote further crosslinking and curing of the system, and only a small amount of resin is required to completely cure the balancing mud gum.

[0132] Furthermore, the balancing mud gum provided by the present invention uses a near-infrared light-thermal synergistic curing mechanism: a thermal initiator is added to the near-infrared light curing system. Due to the thermal effect of near-infrared light, the thermal initiator can be promoted to crack without heating. Under the condition of light-thermal coordination, the balancing mud gum can be completely cured in a shorter time and has a higher compressive strength.

[0133] And the balancing mud gum of the present invention has an appropriate viscosity and is suitable for industrial production.

[0134] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the present invention.

Claims

1. A high filler content balanced mud gum cured by near-infrared, characterized in that, Comprising the following components in parts by weight: The main resin is a multi-functional acrylate oligomer containing two or more acrylate functional groups.

2. The near-infrared-curable high-filler-content balanced mud rubber according to claim 1, characterized in that, Comprising the following components in parts by weight:

3. The near-infrared curable high filler ratio balanced mud gum according to claim 1 or 2, characterized in that, The multi-functional acrylate oligomer is selected from multi-functional epoxy acrylate, multi-functional polyurethane acrylate, multi-functional polyester acrylate, multi-functional polyether acrylate; And / or, the reactive diluent contains one or more acrylate groups in its structure; and has a molecular weight of less than 1000 g / mol and a viscosity of less than 500 cps.

4. The near-infrared curable high-filler proportion balanced mud gum according to claim 1 or 2, characterized in that The filler is selected from one or a combination of ceramic powder, metal powder, metal oxide powder, and inorganic non-metal powder; The ceramic powder includes but is not limited to: alumina, zirconia, zinc oxide, barium titanate, aluminum titanate, boron nitride, aluminum nitride, silicon nitride, silicon nitride; The metal powder includes but is not limited to: tungsten powder, magnesium powder, silver powder, tin powder, nickel powder, iron powder, copper powder, aluminum alloy powder; The metal oxide powder includes but is not limited to: magnesium oxide powder, calcium oxide powder, copper oxide powder, alumina powder, titanium oxide; The inorganic non-metal powder includes but is not limited to: silica, mica powder, graphite powder, kaolin powder.

5. The near-infrared-cured high filler ratio balanced mud gum according to claim 4, characterized in that, The filler is a mixture formed by ceramic powder and a second filler; The second filler is selected from metal powder, metal oxide powder, and inorganic non-metal powder.

6. The near-infrared curable high filler proportion balanced mud gum according to claim 1 or 2, characterized in that The upconversion material is selected from one or a combination of NaYF4, BaYF5, NaGdF4, LiYF4, NaYbF4, Na3ScF6, YF3, GdOF; And / or, the thixotropic agent is selected from one or a combination of fumed silica, hydrogenated castor oil, organic bentonite, polyamide wax; And / or, the auxiliary agent is selected from silane coupling agent, adhesion promoter, antioxidant, dispersant.

7. The near-infrared curable high filler content balanced putty according to claim 1 or 2, characterized in that, The specific gravity of the composition is 2-9 g / cm 3 .

8. The preparation method of the high filler content balanced mud gum cured by near-infrared light according to any one of claims 1-7, characterized in that, The specific steps are as follows: S1. Put the main resin, reactive diluent, and filler into a planetary disperser and disperse evenly under vacuum and light-shielding conditions; S2. Add the initiator, upconversion particles, thixotropic agent, and auxiliary agent, and continue to disperse under vacuum and light-shielding conditions. After the composition is mixed evenly, take it out and package it in a light-shielded and airtight manner for later use.

9. Method for using the near-infrared curable high filler content balanced putty according to any one of claims 1-7, characterized in that, Apply the composition to the part to be used and cure it with a near-infrared light source.

10. According to the usage method described in claim 9, the near-infrared light source is a light source with a wavelength in the range of 780 nm - 2000 nm.

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