Preparation method of high-insulation corrosion-resistant high-temperature-resistant epoxy adhesive for bonding magnetic materials

Abstract

The invention relates to the technical field of preparation of epoxy adhesives, and discloses a preparation method of a high-insulation corrosion-resistant high-temperature-resistant epoxy adhesive for bonding magnetic materials, which comprises a plurality of stages of raw material preparation, mixing, testing and curing, the preparation method comprises the following steps: firstly, preparing bisphenol F epoxy resin, a hydroxyl-terminated imine intermediate, nano silicon dioxide, nano titanium dioxide, nano aluminum oxide, dioxane, a mixed solvent of methylbenzene and DDS, a toughening agent DBP and a curing agent T-31; the preparation method comprises the following steps: heating epoxy resin in a reaction kettle, gradually adding other raw materials, and stirring and dispersing at a specific temperature to obtain a prepared solution; standard data of the extruding machine are obtained through a testing strategy, smoothness of a discharging opening is guaranteed, then curing treatment is conducted according to the standard data, and a prepared solid material is generated; and cutting the prepared solid material to prepare the high-insulation corrosion-resistant high-temperature-resistant epoxy adhesive for bonding the magnetic material.

Description

Technical Field

[0001] The invention relates to the technical field of epoxy adhesive preparation, and in particular to a method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for magnetic material bonding. Background Art

[0002] Epoxy adhesives are widely used in the field of magnetic material bonding due to their excellent mechanical properties, chemical stability and bonding properties; however, with the continuous expansion of application areas, the performance requirements for epoxy adhesives are increasing, especially in terms of high insulation, corrosion resistance, high temperature resistance, etc., which poses new challenges to traditional formulas and processes.

[0003] Traditional epoxy adhesives cannot meet these demanding requirements due to their inherent chemical structure and low heat and corrosion resistance. In addition, the traditional epoxy adhesive preparation method cannot accurately control the temperature of the extruder outlet when converting liquid epoxy adhesive into solid epoxy adhesive, resulting in some outlets being blocked by solidified epoxy adhesive, causing some outlets to smoothly flow out the epoxy adhesive, while some outlets cannot smoothly flow out the epoxy adhesive, resulting in the epoxy adhesive flowing out of each outlet not being able to flow into the cooling tank at the same time, resulting in a waste of raw materials.

[0004] In summary, there is an urgent need for a method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials to improve the insulation, corrosion resistance and high-temperature resistance of the epoxy adhesive and reduce the waste of raw materials in the preparation process of the epoxy adhesive. Summary of the invention

[0005] The present invention provides a method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials, which helps solve the problems mentioned in the above background technology.

[0006] The present invention provides the following technical solution: a method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials, comprising:

[0007] Raw material preparation stage, specifically:

[0008] Prepare the raw materials according to the following mass parts, wherein the mass of each raw material is the same: 90-110 parts of bisphenol F epoxy resin, 30-40 parts of terminal hydroxy imine intermediate, 10-15 parts of nano silicon dioxide, 10-15 parts of nano titanium dioxide, 10-15 parts of nano aluminum oxide, 25-30 parts of a mixed solvent of dioxane, toluene and DDS, 10-15 parts of a toughening agent DBP, and 20-30 parts of a curing agent T-31;

[0009] The raw material mixing stage is as follows:

[0010] S1, adding epoxy resin into a reactor, and continuously heating the reactor, during which the mixed raw materials in the reactor are continuously stirred;

[0011] S2, obtaining the temperature of the mixed raw materials in the reactor, and when the temperature of the mixed raw materials in the reactor is 130° C., adding the terminal hydroxy imine intermediate to the reactor, and continuously heating the reactor, during which the raw materials in the reactor are continuously stirred; when the temperature of the mixed raw materials in the reactor is 160° C., obtaining an imine-modified epoxy resin;

[0012] S3, controlling the temperature of the imine-modified epoxy resin in the reactor to be maintained at 120° C.; when the temperature of the imine-modified epoxy resin in the reactor is maintained at 120° C., adding a mixed solvent of dioxane, toluene and DDS to the imine-modified epoxy resin, and continuously stirring the mixed raw materials in the reactor for 3 hours;

[0013] S4, controlling the temperature of the imine-modified epoxy resin in the reactor to be maintained at 50° C.; when the temperature of the imine-modified epoxy resin in the reactor is maintained at 50° C., adding nano-silicon dioxide, nano-titanium dioxide and nano-aluminum oxide into the reactor, and continuously dispersing the mixed raw materials in the reactor at a high speed for 30 minutes;

[0014] S5, adding toughening agent and curing agent to the reactor; and continuously stirring the mixed raw materials in the reactor for 10 minutes; after the stirring is completed, a high-insulation, corrosion-resistant and high-temperature resistant epoxy adhesive solution for magnetic material bonding is obtained, which is recorded as a preliminary solution;

[0015] Acquire standard data of the extruder according to the test strategy test;

[0016] Solidifying the preliminary solution according to the preliminary solution solidification strategy based on the standard data of the extruder;

[0017] The prepared solution to be solidified is recorded as the prepared solid material;

[0018] The prepared solid material is cut to obtain a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials.

[0019] Optionally, the step of obtaining standard data of the extruder according to the test strategy test specifically includes:

[0020] The extruder includes a feed port, N discharge ports, N heaters and a cooling tank;

[0021] The feed port is used to add the preliminary solution into the extruder;

[0022] The discharge port and the cooling tank are used to convert the liquid prepared solution into a solid linear prepared solid material and cool it;

[0023] The heater is used to heat the discharge port to melt the remaining and solidified preliminary solution on the discharge port, thereby ensuring the unobstructed flow of the discharge port;

[0024] The cooling tank is filled with flowing cold water;

[0025] The testing phase includes:

[0026] Start all heaters to heat all discharge ports, so that none of the discharge ports are blocked by the solidified preliminary solution;

[0027] Add the preliminary solution to the feed port, and when the preliminary solution flows out of all the discharge ports and flows to the cooling tank;

[0028] An outlet is randomly selected, and an image of the prepared solution between the outlet and the cooling tank is collected as a standard image.

[0029] Optionally, the step of obtaining standard data of the extruder according to the test strategy test further includes:

[0030] The standard image is processed as follows:

[0031] According to the direction from the discharge port to the cooling trough, a horizontal dividing line is made every 1 cm to divide the standard image. The dividing lines are recorded as the first dividing line, the second dividing line...the Ath dividing line, where A represents the number of dividing lines;

[0032] According to the direction from the discharge port to the cooling trough, the length of the portion of each segmentation line in the standard image is obtained in sequence, and recorded as the first length, the second length, ... the Ath length respectively;

[0033] The dividing line and the length of the portion of the dividing line in the standard image are paired, recorded as (X, Y), where X refers to the order of the dividing lines and Y refers to the length of the portion of the dividing line in the standard image;

[0034] Get all the pairing relationships, and draw A points in the plane rectangular coordinate system with X in the pairing relationship as the horizontal coordinate and Y as the vertical coordinate;

[0035] A points are fitted into a smooth curve by the least squares method, which is recorded as the standard curve.

[0036] Optionally, the step of obtaining standard data of the extruder according to the test strategy test further includes:

[0037] Select any discharge port and record it as the test discharge port;

[0038] The length of the solidified preliminary solution on the test outlet is controlled to be P, where P is greater than or equal to zero and less than or equal to the minimum distance from the test outlet to the water surface in the cooling tank;

[0039] Adjust the length P so that P traverses all values ​​between zero and the minimum distance from the test outlet to the water surface in the cooling tank;

[0040] Get the standard time period corresponding to each length P, specifically:

[0041] Start the heater corresponding to the test outlet;

[0042] The moment when the heater is started is recorded as the first moment;

[0043] When the preliminary solution flowing out of the test outlet contacts the cold water in the cooling tank, the time of the test is recorded as the second time;

[0044] The time period between the first moment and the second moment is recorded as the standard time period.

[0045] Optionally, the step of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy specifically includes:

[0046] Vibrate the prepared solution;

[0047] Add the vibrated prepared solution into the extruder from the feed port;

[0048] For each outlet of the extruder;

[0049] collecting an image of the prepared solution between the discharge port and the cooling tank as an actual image;

[0050] The actual image is processed as follows:

[0051] According to the direction from the discharge port to the cooling trough, a horizontal dividing line is made every 1 cm to divide the actual image. The dividing lines are recorded as the first dividing line, the second dividing line...the Ath dividing line, where A represents the number of dividing lines;

[0052] According to the direction from the discharge port to the cooling trough, the length of the portion of each segmentation line in the actual image is obtained in sequence, and recorded as the first length, the second length, ... the Ath length respectively;

[0053] The dividing line and the length of the portion of the dividing line in the actual image are paired, recorded as (X, Y), where X refers to the order of the dividing lines and Y refers to the length of the portion of the dividing line in the actual image;

[0054] Get all the pairing relationships, and draw A points in the plane rectangular coordinate system with X in the pairing relationship as the horizontal coordinate and Y as the vertical coordinate;

[0055] The A points are fitted into a smooth curve by the least square method, which is recorded as the actual curve;

[0056] Setting a coincidence threshold, wherein the coincidence threshold is used to compare the minimum similarity between the actual image and the standard image;

[0057] Compare the actual image of each discharge port with the standard image;

[0058] The discharge port corresponding to the actual image whose degree of overlap with the standard image is less than or equal to the overlap threshold is marked as a blocked discharge port.

[0059] Optionally, the step of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy further comprises:

[0060] Get all blocked outlets;

[0061] For each blocked discharge port;

[0062] Obtain the length of the solidified preliminary solution on the discharge port, which are recorded as the first length, the second length, ... the Cth length, respectively, where C refers to the number of blocked discharge ports;

[0063] According to the standard data of the extruder, the standard time periods corresponding to the first length, the second length ... the Cth length are respectively obtained and recorded as the first time period, the second time period ... the Cth time period respectively.

[0064] Optionally, the step of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy further comprises:

[0065] Arrange the first time period, the second time period, ... the Cth time period in order of duration from longest to shortest to form a sequence;

[0066] For each time period in the sequence, obtain the time period difference between it and the previous time period, and record them as the first time period difference, the second time period difference, ... the C-1th time period difference;

[0067] Start the heater at the discharge port corresponding to the first time period in the sequence; after the first time period difference, start the heater at the discharge port corresponding to the second time period in the sequence; after the second time period difference, start the heater at the discharge port corresponding to the third time period in the sequence; after the third time period difference, start the heater at the discharge port corresponding to the fourth time period in the sequence… after the C-1th time period difference, start the heater at the discharge port corresponding to the fourth time period in the sequence.

[0068] Optionally, the step of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy further comprises:

[0069] Obtaining a discharge port with a length of 0 for the solidified preliminary solution, recorded as the flow discharge port;

[0070] Obtain the standard time period corresponding to when the length of the solidified preliminary solution on the discharge port is 0, and record it as the flow time period;

[0071] Calculate the difference between the first time period in the sequence and the standard time period, and record it as the circulation difference;

[0072] The heater of the outlet corresponding to the first time period in the start sequence is started, and after the flow time period has passed, all the flow outlets are opened.

[0073] The present invention has the following beneficial effects:

[0074] 1. A method for preparing a high-insulation, corrosion-resistant and high-temperature resistant epoxy adhesive for bonding magnetic materials. The epoxy resin provides bonding properties, the nanomaterials improve its physical properties, and the imide intermediate can improve its thermal stability and oxidation resistance; the mixed solvent of dioxane, toluene and DDS can not only improve the fluidity of the adhesive, but also help the resin to dissolve better, improve its reactivity and processability; the addition of nano-silicon dioxide, nano-titanium dioxide and nano-alumina can significantly improve the performance of the adhesive, especially in terms of high temperature resistance, corrosion resistance, and mechanical properties; the addition of toughening agents and curing agents can improve the impact resistance, crack resistance and toughness of the adhesive, ensuring that the adhesive maintains sufficient strength and stability during use; the precise proportioning and selection of raw materials directly affect the performance of the final adhesive; through precise proportioning, not only the function of each component is maximized, but also the stability and reliability of the adhesive are improved.

[0075] 2. A method for preparing a high-insulation, corrosion-resistant and high-temperature resistant epoxy adhesive for bonding magnetic materials. In the preparation process of the adhesive, temperature control reaction is crucial; precise control of temperature can effectively promote the chemical reaction between the epoxy resin and the terminal hydroxyimine intermediate, so that the two can form a stable modified structure; during the reaction process, excessively high or low temperature will affect the efficiency and quality of the reaction; by maintaining the temperature in the reactor between 130°C and 160°C, the formation of imine-modified epoxy resin can be ensured, thereby enhancing the thermal stability and antioxidant properties of the resin.

[0076] 3. A method for preparing a high-insulation, corrosion-resistant and high-temperature resistant epoxy adhesive for bonding magnetic materials, collecting an image of a preparatory solution under an unblocked discharge port as a standard image, and dividing the standard image by making a horizontal dividing line every 1 cm in the direction from the discharge port to the cooling trough, obtaining the length of the portion of each dividing line in the standard image, and forming a pairing relationship (X, Y) with the corresponding dividing line, and drawing A points in a plane rectangular coordinate system with X in the pairing relationship as the horizontal coordinate and Y as the vertical coordinate, and then fitting the A points to a standard curve by the least squares method; by obtaining and analyzing the standard curve, it is possible to quickly determine whether the adhesive has ideal fluidity and processing performance; it is helpful to optimize production parameters, ensure the stable performance of the adhesive produced each time, and reduce the production of unqualified products.

[0077] 4. A method for preparing a high-insulation, corrosion-resistant and high-temperature resistant epoxy adhesive for bonding magnetic materials, controls the length of the solidified preliminary solution on the test outlet to be P, and makes P traverse all values ​​between zero and the minimum distance from the test outlet to the water surface in the cooling tank, and then obtains the standard time period corresponding to each length P. In this way, the time required from the beginning of heating the outlet to the time when the preliminary solution flowing out of the outlet flows to the cooling tank under different blockage conditions of the outlet can be obtained; thereby providing an accurate reference for actual production and helping to optimize production parameters.

[0078] 5. A method for preparing a high-insulation, corrosion-resistant and high-temperature resistant epoxy adhesive for bonding magnetic materials. In the actual production process, the actual curve of the prepared solution under each discharge port is obtained, a coincidence threshold is set, and the actual image is compared with the standard curve. If the degree of coincidence between the actual image and the standard curve is less than or equal to the repeatability threshold, it means that the discharge port is blocked and the discharge port needs to be heated; if the degree of coincidence between the actual image and the standard curve is greater than the repeatability threshold, it means that the discharge port is not blocked; in this way, the blocked discharge port can be identified quickly and accurately, and the blocked discharge port can be discovered in time during the flow of the adhesive, thereby avoiding production line pauses or product quality problems.

[0079] 6. A method for preparing a high-insulation, corrosion-resistant and high-temperature resistant epoxy adhesive for bonding magnetic materials. For each blocked discharge port, the length of the solidified preliminary solution on the discharge port is obtained, and the standard time period corresponding to each length is obtained according to the standard data, and these time periods are sorted in order from long to short to form a sequence. For each time period in the sequence, the time period difference between it and the previous time period is obtained; according to the order of the time periods in the sequence, the heater corresponding to the discharge port is started in sequence at intervals of the first time period difference, the second time period difference...the C-1 time period difference; for each flowing discharge port, the solidified preliminary solution on the discharge port is obtained. The standard time period corresponding to the length of the liquid is 0, which is recorded as the circulation time period; the circulation time period is the time required for the preliminary solution to stay in the cooling tank from the unblocked discharge port; the difference between the time period ranked first in the sequence and the standard time period is calculated, which is recorded as the circulation difference; after the heater of the discharge port corresponding to the first time period in the sequence is turned on for the circulation difference, all the circulation discharge ports are opened; through the above method, the preliminary solution flowing out of all the discharge ports can be kept in the cooling tank at the same time; the time waste in the production process can be reduced, and the efficiency of each production can be improved; this technology is of great significance to improving production efficiency and the performance stability of adhesives. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Figure 1 It is a schematic diagram of the extruder of the present invention. DETAILED DESCRIPTION

[0081] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0082] Example, see Figure 1 , a method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials, comprising:

[0083] Raw material preparation stage, specifically:

[0084] Prepare the raw materials according to the following mass parts, wherein the mass of each raw material is the same: 90-110 parts of bisphenol F epoxy resin, 30-40 parts of terminal hydroxy imine intermediate, 10-15 parts of nano silicon dioxide, 10-15 parts of nano titanium dioxide, 10-15 parts of nano aluminum oxide, 25-30 parts of a mixed solvent of dioxane, toluene and DDS, 10-15 parts of a toughening agent DBP, and 20-30 parts of a curing agent T-31;

[0085] The raw material mixing stage is as follows:

[0086] S1, adding epoxy resin into a reactor, and continuously heating the reactor, during which the mixed raw materials in the reactor are continuously stirred;

[0087] S2, obtaining the temperature of the mixed raw materials in the reactor, and when the temperature of the mixed raw materials in the reactor is 130° C., adding the terminal hydroxy imine intermediate to the reactor, and continuously heating the reactor, during which the raw materials in the reactor are continuously stirred; when the temperature of the mixed raw materials in the reactor is 160° C., obtaining an imine-modified epoxy resin;

[0088] S3, controlling the temperature of the imine-modified epoxy resin in the reactor to be maintained at 120° C.; when the temperature of the imine-modified epoxy resin in the reactor is maintained at 120° C., adding a mixed solvent of dioxane, toluene and DDS to the imine-modified epoxy resin, and continuously stirring the mixed raw materials in the reactor for 3 hours;

[0089] S4, controlling the temperature of the imine-modified epoxy resin in the reactor to be maintained at 50° C.; when the temperature of the imine-modified epoxy resin in the reactor is maintained at 50° C., adding nano-silicon dioxide, nano-titanium dioxide and nano-aluminum oxide into the reactor, and continuously dispersing the mixed raw materials in the reactor at a high speed for 30 minutes;

[0090] S5, adding toughening agent and curing agent to the reactor; and continuously stirring the mixed raw materials in the reactor for 10 minutes; after the stirring is completed, a high-insulation, corrosion-resistant and high-temperature resistant epoxy adhesive solution for magnetic material bonding is obtained, which is recorded as a preliminary solution;

[0091] The invention discloses a method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials. The epoxy resin provides bonding performance, the nanomaterial improves its physical properties, and the imide intermediate can improve its thermal stability and oxidation resistance. The mixed solvent of dioxane, toluene and DDS can not only improve the fluidity of the adhesive, but also help the resin to dissolve better, and improve its reactivity and processability. The addition of nano-silicon dioxide, nano-titanium dioxide and nano-aluminum oxide can significantly improve the performance of the adhesive, especially in terms of high temperature resistance, corrosion resistance, and mechanical properties. The addition of toughening agent and curing agent can improve the impact resistance, crack resistance and toughness of the adhesive, and ensure that the adhesive maintains sufficient strength and stability during use. The precise proportioning and selection of raw materials directly affect the performance of the final adhesive. Through precise proportioning, not only the function of each component is maximized, but also the stability and reliability of the adhesive are improved.

[0092] The invention discloses a method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials. In the preparation process of the adhesive, temperature control reaction is crucial; precise temperature control can effectively promote the chemical reaction between the epoxy resin and the terminal hydroxy imine intermediate, so that the two can form a stable modified structure; during the reaction process, too high or too low temperature will affect the efficiency and quality of the reaction; by maintaining the temperature in the reactor between 130° C. and 160° C., the formation of the imine-modified epoxy resin can be ensured, and the thermal stability and oxidation resistance of the resin can be enhanced;

[0093] Acquire standard data of the extruder according to the test strategy test;

[0094] Solidifying the preliminary solution according to the preliminary solution solidification strategy based on the standard data of the extruder;

[0095] The prepared solution to be solidified is recorded as the prepared solid material;

[0096] The prepared solid material is cut to obtain a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials.

[0097] The method of obtaining standard data of the extruder according to the test strategy specifically includes:

[0098] The extruder includes a feed port, N discharge ports, N heaters and a cooling tank;

[0099] The feed port is used to add the preliminary solution into the extruder;

[0100] The discharge port and the cooling tank are used to convert the liquid prepared solution into a solid linear prepared solid material and cool it;

[0101] The heater is used to heat the discharge port to melt the remaining and solidified preliminary solution on the discharge port, thereby ensuring the unobstructed flow of the discharge port;

[0102] The cooling tank is filled with flowing cold water;

[0103] The testing phase includes:

[0104] Start all heaters to heat all discharge ports, so that none of the discharge ports are blocked by the solidified preliminary solution;

[0105] Add the preliminary solution to the feed port, and when the preliminary solution flows out of all the discharge ports and flows to the cooling tank;

[0106] An outlet is randomly selected, and an image of the prepared solution between the outlet and the cooling tank is collected as a standard image.

[0107] The method of obtaining standard data of the extruder according to the test strategy test also includes:

[0108] The standard image is processed as follows:

[0109] According to the direction from the discharge port to the cooling trough, a horizontal dividing line is made every 1 cm to divide the standard image. The dividing lines are recorded as the first dividing line, the second dividing line...the Ath dividing line, where A represents the number of dividing lines;

[0110] According to the direction from the discharge port to the cooling trough, the length of the portion of each segmentation line in the standard image is obtained in sequence, and recorded as the first length, the second length, ... the Ath length respectively;

[0111] The dividing line and the length of the portion of the dividing line in the standard image are paired, recorded as (X, Y), where X refers to the order of the dividing lines and Y refers to the length of the portion of the dividing line in the standard image;

[0112] Get all the pairing relationships, and draw A points in the plane rectangular coordinate system with X in the pairing relationship as the horizontal coordinate and Y as the vertical coordinate;

[0113] Use the least squares method to fit A points into a smooth curve, which is recorded as the standard curve;

[0114] The invention discloses a method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials. The method comprises the following steps: collecting an image of a preparatory solution under an unblocked discharge port as a standard image, and dividing the standard image by making a horizontal dividing line every 1 cm in the direction from the discharge port to the cooling tank, obtaining the length of the portion of each dividing line in the standard image, and forming a pairing relationship (X, Y) with the corresponding dividing line, and drawing A points in a plane rectangular coordinate system with X in the pairing relationship as the horizontal coordinate and Y as the vertical coordinate, and then fitting the A points into a standard curve by the least square method; by obtaining and analyzing the standard curve, it is possible to quickly determine whether the adhesive has ideal fluidity and processing performance; and it is helpful to optimize production parameters, ensure the stable performance of the adhesive produced each time, and reduce the generation of unqualified products.

[0115] The method of obtaining standard data of the extruder according to the test strategy test also includes:

[0116] Select any discharge port and record it as the test discharge port;

[0117] The length of the solidified preliminary solution on the test outlet is controlled to be P, where P is greater than or equal to zero and less than or equal to the minimum distance from the test outlet to the water surface in the cooling tank;

[0118] Adjust the length P so that P traverses all values ​​between zero and the minimum distance from the test outlet to the water surface in the cooling tank;

[0119] Get the standard time period corresponding to each length P, specifically:

[0120] Start the heater corresponding to the test outlet;

[0121] The moment when the heater is started is recorded as the first moment;

[0122] When the preliminary solution flowing out of the test outlet contacts the cold water in the cooling tank, the time of the test is recorded as the second time;

[0123] The time period between the first moment and the second moment is recorded as the standard time period;

[0124] The invention discloses a method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials. The method controls the length of a solidified preliminary solution on a test outlet to be P, and makes P traverse all values ​​between zero and the minimum distance from the test outlet to the water surface in a cooling tank. Then, the standard time period corresponding to each length P is obtained. In this way, the time required from the beginning of heating the outlet to the flow of the preliminary solution flowing out of the outlet to the cooling tank under different blockage conditions of the outlet can be obtained. Thus, an accurate reference is provided for actual production, which is helpful for optimizing production parameters.

[0125] The method of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy specifically includes:

[0126] Vibrate the prepared solution;

[0127] Add the vibrated prepared solution into the extruder from the feed port;

[0128] For each outlet of the extruder;

[0129] collecting an image of the prepared solution between the discharge port and the cooling tank as an actual image;

[0130] The actual image is processed as follows:

[0131] According to the direction from the discharge port to the cooling trough, a horizontal dividing line is made every 1 cm to divide the actual image. The dividing lines are recorded as the first dividing line, the second dividing line...the Ath dividing line, where A represents the number of dividing lines;

[0132] According to the direction from the discharge port to the cooling trough, the length of the portion of each segmentation line in the actual image is obtained in sequence, and recorded as the first length, the second length, ... the Ath length respectively;

[0133] The dividing line and the length of the portion of the dividing line in the actual image are paired, recorded as (X, Y), where X refers to the order of the dividing lines and Y refers to the length of the portion of the dividing line in the actual image;

[0134] Get all the pairing relationships, and draw A points in the plane rectangular coordinate system with X in the pairing relationship as the horizontal coordinate and Y as the vertical coordinate;

[0135] The A points are fitted into a smooth curve by the least square method, which is recorded as the actual curve;

[0136] Setting a coincidence threshold, wherein the coincidence threshold is used to compare the minimum similarity between the actual image and the standard image;

[0137] Compare the actual image of each discharge port with the standard image;

[0138] The discharge port corresponding to the actual image whose overlap degree with the standard image is less than or equal to the overlap degree threshold is marked as a blocked discharge port;

[0139] The invention discloses a method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials. In the actual production process, the actual curve of the prepared solution under each discharge port is obtained, a coincidence threshold is set, and the actual image is compared with the standard curve. If the coincidence degree between the actual image and the standard curve is less than or equal to the repeatability threshold, it means that the discharge port is blocked and the discharge port needs to be heated; if the coincidence degree between the actual image and the standard curve is greater than the repeatability threshold, it means that the discharge port is not blocked. In this way, the blocked discharge port can be identified quickly and accurately, and the blocked discharge port can be found in time during the flow of the adhesive, thereby avoiding production line pauses or product quality problems.

[0140] The method of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy also includes:

[0141] Get all blocked outlets;

[0142] For each blocked discharge port;

[0143] Obtain the length of the solidified preliminary solution on the discharge port, which are recorded as the first length, the second length, ... the Cth length, respectively, where C refers to the number of blocked discharge ports;

[0144] According to the standard data of the extruder, the standard time periods corresponding to the first length, the second length ... the Cth length are respectively obtained and recorded as the first time period, the second time period ... the Cth time period respectively.

[0145] The method of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy also includes:

[0146] Arrange the first time period, the second time period, ... the Cth time period in order of duration from longest to shortest to form a sequence;

[0147] For each time period in the sequence, obtain the time period difference between it and the previous time period, and record them as the first time period difference, the second time period difference, ... the C-1th time period difference;

[0148] Start the heater at the discharge port corresponding to the first time period in the sequence; after the first time period difference, start the heater at the discharge port corresponding to the second time period in the sequence; after the second time period difference, start the heater at the discharge port corresponding to the third time period in the sequence; after the third time period difference, start the heater at the discharge port corresponding to the fourth time period in the sequence… after the C-1th time period difference, start the heater at the discharge port corresponding to the fourth time period in the sequence.

[0149] The method of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy also includes:

[0150] Obtaining a discharge port with a length of 0 for the solidified preliminary solution, recorded as the flow discharge port;

[0151] Obtain the standard time period corresponding to when the length of the solidified preliminary solution on the discharge port is 0, and record it as the flow time period;

[0152] Calculate the difference between the first time period in the sequence and the standard time period, and record it as the circulation difference;

[0153] The heater of the outlet corresponding to the first time period in the start sequence is started, and after the flow time period has passed, all the flow outlets are opened;

[0154] The method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials comprises the following steps: for each blocked discharge port, obtaining the length of a solidified preliminary solution on the discharge port, obtaining the standard time period corresponding to each length according to standard data, and sorting these time periods in order from long to short to form a sequence; for each time period in the sequence, obtaining the time period difference between it and the previous time period; according to the order of the time periods in the sequence, starting the heater corresponding to the discharge port in sequence at intervals of the first time period difference, the second time period difference ... the C-1 time period difference; for each flowing discharge port, obtaining the solidified preliminary solution on the discharge port; The standard time period corresponding to the length of 0 is recorded as the circulation time period; the circulation time period is the time required for the preliminary solution to stay in the cooling tank from the unblocked discharge port; the difference between the time period ranked first in the sequence and the standard time period is calculated, and recorded as the circulation difference; after the heater of the discharge port corresponding to the first time period in the sequence is turned on for the circulation difference, all the circulation discharge ports are opened; in the above manner, the preliminary solution flowing out of all the discharge ports can be simultaneously retained in the cooling tank; the time waste in the production process can be reduced, and the efficiency of each production can be improved; this technology is of great significance to improving production efficiency and the performance stability of adhesives.

[0155] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0156] 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 technical principles 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 high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials, characterized in that: include: Raw material preparation stage, specifically: Prepare the raw materials according to the following mass parts, wherein the mass of each raw material is the same: 90-110 parts of bisphenol F epoxy resin, 30-40 parts of terminal hydroxy imine intermediate, 10-15 parts of nano silicon dioxide, 10-15 parts of nano titanium dioxide, 10-15 parts of nano aluminum oxide, 25-30 parts of a mixed solvent of dioxane, toluene and DDS, 10-15 parts of a toughening agent DBP, and 20-30 parts of a curing agent T-31; The raw material mixing stage is as follows: S1, adding epoxy resin into a reactor, and continuously heating the reactor, during which the mixed raw materials in the reactor are continuously stirred; S2, obtaining the temperature of the mixed raw materials in the reactor, and when the temperature of the mixed raw materials in the reactor is 130° C., adding the terminal hydroxy imine intermediate to the reactor, and continuously heating the reactor, during which the raw materials in the reactor are continuously stirred; when the temperature of the mixed raw materials in the reactor is 160° C., obtaining an imine-modified epoxy resin; S3, controlling the temperature of the imine-modified epoxy resin in the reactor to be maintained at 120° C.; when the temperature of the imine-modified epoxy resin in the reactor is maintained at 120° C., adding a mixed solvent of dioxane, toluene and DDS to the imine-modified epoxy resin, and continuously stirring the mixed raw materials in the reactor for 3 hours; S4, controlling the temperature of the imine-modified epoxy resin in the reactor to be maintained at 50° C.; when the temperature of the imine-modified epoxy resin in the reactor is maintained at 50° C., adding nano-silicon dioxide, nano-titanium dioxide and nano-aluminum oxide into the reactor, and continuously dispersing the mixed raw materials in the reactor at a high speed for 30 minutes; S5, adding toughening agent and curing agent to the reactor; and continuously stirring the mixed raw materials in the reactor for 10 minutes; after the stirring is completed, a high-insulation, corrosion-resistant and high-temperature resistant epoxy adhesive solution for magnetic material bonding is obtained, which is recorded as a preliminary solution; Acquire standard data of the extruder according to the test strategy test; Solidifying the preliminary solution according to the preliminary solution solidification strategy based on the standard data of the extruder; The prepared solution to be solidified is recorded as the prepared solid material; The prepared solid material is cut to obtain a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials.

2. The method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials according to claim 1, characterized in that: The method of obtaining standard data of the extruder according to the test strategy specifically includes: The extruder includes a feed port, N discharge ports, N heaters and a cooling tank; The feed port is used to add the preliminary solution to the extruder; The discharge port and the cooling tank are used to convert the liquid prepared solution into a solid linear prepared solid material and cool it; The heater is used to heat the discharge port to melt the remaining and solidified preliminary solution on the discharge port, thereby ensuring the unobstructed flow of the discharge port; The cooling tank is filled with flowing cold water; The testing phase is as follows: Start all heaters to heat all discharge ports, so that none of the discharge ports are blocked by the solidified preliminary solution; Add the preliminary solution to the feed port, and when the preliminary solution flows out of all the discharge ports and flows to the cooling tank; An outlet is randomly selected, and an image of the prepared solution between the outlet and the cooling tank is collected as a standard image.

3. The method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials according to claim 2, characterized in that: The method of obtaining standard data of the extruder according to the test strategy test also includes: The standard image is processed as follows: According to the direction from the discharge port to the cooling trough, a horizontal dividing line is made every 1 cm to divide the standard image. The dividing lines are recorded as the first dividing line, the second dividing line...the Ath dividing line, where A represents the number of dividing lines; According to the direction from the discharge port to the cooling trough, the length of the portion of each segmentation line in the standard image is obtained in sequence, and recorded as the first length, the second length, ... the Ath length respectively; The dividing line and the length of the portion of the dividing line in the standard image are paired, recorded as (X, Y), where X refers to the order of the dividing lines and Y refers to the length of the portion of the dividing line in the standard image; Get all the pairing relationships, and draw A points in the plane rectangular coordinate system with X in the pairing relationship as the horizontal coordinate and Y as the vertical coordinate; A points are fitted into a smooth curve by the least squares method, which is recorded as the standard curve.

4. The method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials according to claim 2, characterized in that: The method of obtaining standard data of the extruder according to the test strategy test also includes: Select any discharge port and record it as the test discharge port; The length of the solidified preliminary solution on the test outlet is controlled to be P, where P is greater than or equal to zero and less than or equal to the minimum distance from the test outlet to the water surface in the cooling tank; Adjust the length P so that P traverses all values ​​between zero and the minimum distance from the test outlet to the water surface in the cooling tank; Get the standard time period corresponding to each length P, specifically: Start the heater corresponding to the test outlet; The moment when the heater is started is recorded as the first moment; When the preliminary solution flowing out of the test outlet contacts the cold water in the cooling tank, the time of the test is recorded as the second time; The time period between the first moment and the second moment is recorded as the standard time period.

5. The method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials according to claim 1, characterized in that: The method of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy specifically includes: Vibrate the prepared solution; Add the vibrated prepared solution into the extruder from the feed port; For each outlet of the extruder; collecting an image of the prepared solution between the discharge port and the cooling tank as an actual image; The actual image is processed as follows: According to the direction from the discharge port to the cooling trough, a horizontal dividing line is made every 1 cm to divide the actual image. The dividing lines are recorded as the first dividing line, the second dividing line...the Ath dividing line, where A represents the number of dividing lines; According to the direction from the discharge port to the cooling trough, the length of the portion of each segmentation line in the actual image is obtained in sequence, and recorded as the first length, the second length, ... the Ath length respectively; The dividing line and the length of the portion of the dividing line in the actual image are paired, recorded as (X, Y), where X refers to the order of the dividing lines and Y refers to the length of the portion of the dividing line in the actual image; Get all the pairing relationships, and draw A points in the plane rectangular coordinate system with X in the pairing relationship as the horizontal coordinate and Y as the vertical coordinate; The A points are fitted into a smooth curve by the least square method, which is recorded as the actual curve; Setting a coincidence threshold, wherein the coincidence threshold is used to compare the minimum similarity between the actual image and the standard image; Compare the actual image of each discharge port with the standard image; The discharge port corresponding to the actual image whose degree of overlap with the standard image is less than or equal to the overlap threshold is marked as a blocked discharge port.

6. The method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials according to claim 5, characterized in that: The method of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy also includes: Get all blocked outlets; For each blocked discharge port; Obtain the length of the solidified preliminary solution on the discharge port, which are recorded as the first length, the second length, ... the Cth length, respectively, where C refers to the number of blocked discharge ports; According to the standard data of the extruder, the standard time periods corresponding to the first length, the second length ... the Cth length are respectively obtained and recorded as the first time period, the second time period ... the Cth time period respectively.

7. The method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials according to claim 6, characterized in that: The method of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy also includes: Arrange the first time period, the second time period, ... the Cth time period in order of duration from longest to shortest to form a sequence; For each time period in the sequence, obtain the time period difference between it and the previous time period, and record them as the first time period difference, the second time period difference, ... the C-1th time period difference; Start the heater at the discharge port corresponding to the first time period in the sequence; after the first time period difference, start the heater at the discharge port corresponding to the second time period in the sequence; after the second time period difference, start the heater at the discharge port corresponding to the third time period in the sequence; after the third time period difference, start the heater at the discharge port corresponding to the fourth time period in the sequence… after the C-1th time period difference, start the heater at the discharge port corresponding to the fourth time period in the sequence.

8. The method for preparing a high-insulation, corrosion-resistant and high-temperature-resistant epoxy adhesive for bonding magnetic materials according to claim 7, characterized in that: The method of curing the preliminary solution according to the standard data of the extruder and the preliminary solution curing strategy also includes: Obtaining a discharge port with a length of 0 for the solidified preliminary solution, recorded as the flow discharge port; Obtain the standard time period corresponding to when the length of the solidified preliminary solution on the discharge port is 0, and record it as the flow time period; Calculate the difference between the first time period in the sequence and the standard time period, and record it as the circulation difference; The heater of the outlet corresponding to the first time period in the start sequence is started, and after the flow time period has passed, all the flow outlets are opened.

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