A fireproof composite expansion sheet and preparation method thereof

Abstract

The invention relates to the technical field of composite expansion sheets, and discloses a fireproof composite expansion sheet, which is composed of a high-sealing expansion sheet, a heat-sensitive adhesive coated on one side of the sheet, and wax paper compounded with the heat-sensitive adhesive. The preparation raw materials include EVA, 20-25 parts of AC foaming agent, 55-65 parts of lead stearate, 1-3 parts of polyethylene wax, 7-10 parts of polyvinyl chloride, 3-5 parts of EPDM rubber, 5-8 parts of silicone rubber, 0.2-1.5 parts of antioxidant, 12-17 parts of polymer, 0.5-1 parts of heat-sensitive organic-inorganic composite powder, and 0.3-1 parts of plasticizer, stabilizer, lubricant, hot-melt adhesive, processing aid, and filler. In the invention, the temperature of each partition inside a high-speed mixer is monitored in real time by a temperature control component arranged in the process of stirring and mixing raw materials, and a relevant temperature change curve is generated to a control terminal according to the detection result, so that people can understand the temperature change of each area inside the equipment in real time through the generated chart data.

Description

Technical Field

[0001] The invention relates to the technical field of composite expansion sheets, and in particular to a fireproof composite expansion sheet and a preparation method thereof. Background Art

[0002] The existing domestically manufactured cars generally have gaps and cavities between the various metal and non-metal parts of the assembled cars, which cause vibration and noise when the car is running, thus affecting the car's comfort. At the same time, it also causes noise pollution to the surrounding environment and limits the further improvement of the domestic car manufacturing level and car grade.

[0003] In the prior art, people often use independent temperature detection devices to detect the temperature inside the equipment during the mixing and stirring process.

[0004] However, in actual use, when materials are stirred and mixed in large quantities, there will always be a certain difference in temperature between the end close to the heat source and the end far away from the heat source in the high-speed mixer. Therefore, during the heating and stirring process, the internal materials will be affected by the temperature difference, thereby affecting the reaction rate between the substances. Therefore, in order to ensure sufficient mutual reaction between the materials during stirring and mixing, people often need to increase the mixing time to ensure that the internal materials can fully react with each other. In view of this, we propose a fire-proof composite expansion sheet and a preparation method thereof. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides a fireproof composite expansion sheet and a preparation method thereof, aiming to improve the problem in the prior art that there is a certain difference in temperature between the material close to the heat source end and the material far from the heat source end during the mixing process.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: by weight, the raw materials for preparation include EVA, 20-25 parts of AC foaming agent, 65-75 parts of lead stearate, 1-3 parts of polyethylene wax, 7-10 parts of polyvinyl chloride, 3-5 parts of EPDM rubber, 5-8 parts of silicone rubber, 0.2-1.5 parts of antioxidant, 12-17 parts of polymer, 0.5-1 parts of thermosensitive organic-inorganic composite powder, and 0.3-1 parts of plasticizer, stabilizer, lubricant, hot-melt adhesive, processing aid and filler.

[0007] The silicone rubber is a mixed silicone rubber, and examples of the mixed silicone rubber include methyl silicone rubber, methyl vinyl silicone rubber, methyl vinyl phenyl silicone rubber, and fluorosilicone rubber, or a combination of several thereof.

[0008] Silicone rubber and EPDM rubber both have excellent heat aging properties, but silicone rubber has poor mechanical properties and is expensive; EPDM rubber has a slow vulcanization speed, poor self-adhesion and mutual adhesion, and poor processing performance. Therefore, blending the two can make up for their respective shortcomings and produce products with better comprehensive performance than a single type of rubber. The presence of silicone rubber solves the problem of low strength of the molten layer of polyvinyl chloride polymer and inability to expand effectively.

[0009] As a further description of the above technical solution:

[0010] The thermosensitive organic-inorganic composite powder is obtained by reacting metal powder, metal oxide powder, conductive polymer powder, coupling agent and auxiliary agent; the polymer can be any one of polyethylene, polyethylene / vinyl acetate EVA, ethylene-propylene terpolymer EPDM, chloroprene rubber, polypropylene, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene and polyvinylidene fluoride; the plasticizer can be any one of phthalate esters, polyesters, citrate esters, phosphate esters and epoxy soybean oil.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] The following steps are involved:

[0013] S1: Material Selection

[0014] According to the actual performance requirements of the high-sealing composite expansion sheet, the specific material to be added is determined;

[0015] S2: Material Handling

[0016] Pre-treat each material and mix the heat-sensitive organic-inorganic composite powder that needs to be pre-mixed;

[0017] S3: Stirring and mixing

[0018] Use a high-speed mixer to mix the materials waiting to be mixed;

[0019] S4: Extrusion shaping

[0020] Use an extruder to extrude the stirred material at a certain temperature;

[0021] S5: Cooling and solidification

[0022] The plasticized expansion sheet is placed in a water cooling circulation device and cooled by water cooling;

[0023] S6: Cutting and forming

[0024] Using cutting tools or forming machinery, the expansion sheet is cut into the desired shape and size;

[0025] S7: Sampling and testing

[0026] The generated expansion sheets are taken out by a sampling method for independent performance testing, and the performance of the batch of expansion sheets is determined based on the test data.

[0027] As a further description of the above technical solution:

[0028] The S1 material selection is mainly used to determine the raw material components of the processing batch, including the following steps:

[0029] S101: Finished product performance indicators

[0030] Determine the actual finished product performance requirements and use them as the testing indicators in S7;

[0031] S102: Raw material inspection

[0032] Sampling and testing the raw materials according to the ingredient content labels, and determining whether the raw materials meet the production and processing requirements;

[0033] S103: Raw material ratio

[0034] Determine the specific amount of each component in the raw material according to the actual finished product demand;

[0035] S104: Arrangement Processing

[0036] According to the order in which the raw materials are added into the high-speed mixer, the raw materials are discharged to the feeding rack in order.

[0037] As a further description of the above technical solution:

[0038] The S2 material processing is used to pre-process the raw materials so that they can meet the stirring and mixing requirements, and includes the following steps:

[0039] S201: Indicator Designation

[0040] Determine the delivery requirements for each group of materials, including temperature, raw material particle size and state;

[0041] S202: Raw material preheating

[0042] Use a heating stirrer to preheat the raw materials and reduce the agglomeration of the powdered raw materials due to moisture absorption;

[0043] S203: Vibration screening

[0044] Use a standard mesh vibrating screen to screen the raw material particle size, and crush the materials that do not meet the particle size;

[0045] S204: Mixed processing

[0046] Metal powder, metal oxide powder, conductive polymer powder, coupling agent and auxiliary material are sequentially added into the reaction kettle, and the stirring speed is maintained at 1000-2000 rpm for low-speed mixing for 2-5 minutes to obtain a mixed thermosensitive organic-inorganic composite powder.

[0047] As a further description of the above technical solution:

[0048] The step S3 of stirring and mixing requires real-time monitoring of the temperature and reaction state during the stirring process, including the following steps:

[0049] S301: Temperature Control

[0050] A heating component and a cooling component are arranged inside the high-speed mixer, and the working states of the heating component and the cooling component are controlled by a temperature control terminal;

[0051] S302: Temperature monitoring

[0052] An infrared temperature measuring device is installed at the high-speed mixer to monitor the regional temperature inside the high-speed mixer in real time;

[0053] S303: Chart conversion

[0054] Generate a corresponding time-temperature line graph based on the temperature detection result of the infrared temperature measuring device;

[0055] S304: Air pressure control

[0056] The air pressure status inside the equipment is monitored in real time through the air pressure detection device, and when the air pressure inside the equipment is insufficient, neon gas is filled into it to replenish the air pressure to the standard range.

[0057] As a further description of the above technical solution:

[0058] The S4 extrusion shaping is mainly used to inject the mixed material into the mold for preliminary shaping and extrusion of its shape:

[0059] S401: Vacuum injection

[0060] Use a vacuum machine to evacuate the injection port and ensure that the air pressure there is -0.04Mpa;

[0061] S402: Equipment Tuning

[0062] Set the extruder screw rotation speed and keep the internal mixed material extruded at a constant speed;

[0063] S403: Temperature detection

[0064] Control the extrusion temperature of the extruder and keep the temperature during extrusion to meet the requirements.

[0065] As a further description of the above technical solution:

[0066] The cooling and curing in S5 mainly controls the water cooling state by controlling the temperature of the water cooling liquid inside the water cooling pipe, and includes the following steps:

[0067] S501: Cooling test

[0068] The temperature of the composite expansion sheet in the cooling mold is detected by an infrared temperature measuring device, and the temperature of the coolant in the water cooling device is detected by a control end of the water cooling device;

[0069] S502: Curve setting

[0070] The estimated cooling temperature curve is set according to the actual cooling temperature requirement, and the infrared temperature measuring device generates a corresponding temperature change curve for the temperature detected at the composite expansion sheet;

[0071] S503: Curve comparison

[0072] The processing system compares the set temperature curve C_1 and the temperature curve C_2 obtained by time detection, and calculates the similarity through the Euclidean distance between the n feature points in the two sets of curves. The algorithm formula steps are as follows:

[0073] [C_1={(x_{1,1},y_{1,1}),(x_{1,2},y_{1,2}),\ldots,(x_{1,n},y_{1,n})}];

[0074] [C_2={(x_{2,1},y_{2,1}),(x_{2,2},y_{2,2}),\ldots,(x_{2,n},y_{2,n})}];

[0075] Calculate the difference between the horizontal and vertical axes to get ((\Deltax_i,\Deltay_i)), then square the difference of each point to get ((\Deltax_i)^2) and ((\Deltay_i)^2), add the squared differences to get (\sum_{i=1}^{n}(\Deltax_i)^2+(\Deltay_i)^2), and finally take the square root of the value to get the final Euclidean distance. The smaller the value of the Euclidean distance, the more similar the curves are, and vice versa, the larger the value, the more dissimilar the curves are.

[0076] S504: Cooling control

[0077] Finally, the curve similarity data obtained based on the Euclidean distance is used to determine whether the current cooling state meets the set temperature change requirements. If the similarity is less than the set threshold, the water cooling device will systematically intervene in its cooling process by controlling the internal coolant temperature.

[0078] As a further description of the above technical solution:

[0079] The S6 cutting and forming will perform standardized cutting processing on the shape of the composite expansion sheet after cooling, including the following steps:

[0080] S601: Standard Modeling

[0081] A standardized composite expansion sheet model is established through 3D software and imported into the system;

[0082] S602: Automated cutting

[0083] The composite expansion sheet obtained by modeling is trimmed and cut using automated cutting equipment.

[0084] As a further description of the above technical solution:

[0085] The S7 sampling test will be carried out according to the 100:3 standard, including the following steps:

[0086] S701: Appearance inspection

[0087] The appearance of the finished composite expansion sheet is inspected through model matching, and the degree of edge burrs is inspected;

[0088] S702: Expansion coefficient

[0089] The expansion coefficient parameters of the composite expansion sheet are tested, and the specific calculation method of the expansion coefficient α is as follows:

[0090] [α=\frac{{\DeltaL}}{{L_0\cdot\DeltaT}}];

[0091] in:

[0092] (α) is the linear expansion coefficient (unit: 1 / degree Celsius or 1 / Kelvin);

[0093] (\DeltaL) is the change in length (usually in meters);

[0094] (L_0) is the length of the object at the initial temperature (usually in meters);

[0095] (\DeltaT) is the temperature change (in degrees Celsius or Kelvin);

[0096] S703: Impact pressure detection

[0097] The composite expansion sheet is clamped and fixed, and its impact resistance and pressure bearing capacity are tested through external pressure-adjustable equipment;

[0098] S704: Report Generation

[0099] Generate a corresponding test report based on the data obtained from the actual test, and compare it with the performance requirements set in S1 to obtain the final product quality judgment.

[0100] Compared with the prior art, the present invention has the following beneficial effects:

[0101] 1. In the present invention, the temperature of each partition inside the high-speed mixer, including the upper end, middle part and lower end of the high-speed mixer, will be monitored in real time by a temperature control component arranged during the mixing process of the raw materials, and a corresponding temperature change curve will be generated according to the detection result, and the temperature change curve will be fed back to the control terminal, so that people can understand the temperature change of each area inside the equipment in real time through the generated chart data, thereby avoiding the quality degradation of the composite expansion sheet caused by uneven heating.

[0102] 2. In the present invention, the cooling efficiency is improved by water cooling. At the same time, during the water cooling process, the water cooling efficiency needs to be controlled by the temperature of the internal coolant through the water cooling device. In addition, during the water cooling process, the internal temperature of the composite expansion piece being cooled is detected by an infrared temperature measuring device, and the cooling efficiency of the water cooling device is controlled by the difference between the actual temperature curve and the set temperature change curve, so as to avoid affecting the internal structure of the composite expansion piece due to too fast cooling.

[0103] 3. In the present invention, the mixed and stirred materials are injected into the extruder by vacuum injection, and the vacuum stability is maintained during the injection process. When the injection is completed, the extruder feed port is closed and the air pressure is restored, thereby reducing the probability of external air entering the material during the transmission process to generate bubbles, thereby improving the overall performance of the finished composite expansion sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0104] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0105] Figure 1 is a flow chart of the method of the present invention;

[0106] Figure 2 This is a flow chart of the S1 method of the present invention;

[0107] Figure 3 This is a flow chart of the S2 method of the present invention;

[0108] Figure 4 This is a flow chart of the S3 method of the present invention;

[0109] Figure 5 This is a flow chart of the S4 method of the present invention;

[0110] Figure 6 This is a flow chart of the S5 method of the present invention;

[0111] Figure 7 This is a flow chart of the S6 method of the present invention;

[0112] Figure 8 This is a flow chart of the S7 method of the present invention. Implementation

[0113] The following will be combined with the drawings in the specification 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.

[0114] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0115] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0116] The present invention provides an embodiment: a fireproof composite expansion sheet, wherein the preparation raw materials include EVA, 20-25 parts of AC foaming agent, 65-75 parts of lead stearate, 1-3 parts of polyethylene wax, 0.2-1.5 parts of antioxidant, 12-17 parts of polymer, 0.5-1 part of thermosensitive organic-inorganic composite powder, and 0.3-1 part of plasticizer, stabilizer, lubricant, hot melt adhesive, processing aid and filler.

[0117] Specifically, the thermosensitive organic-inorganic composite powder is obtained by reacting metal powder, metal oxide powder, conductive polymer powder, coupling agent and auxiliary agent. The polymer can be any one of polyethylene, polyethylene / vinyl acetate EVA, ethylene-propylene terpolymer EPDM, chloroprene rubber, polypropylene, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene and polyvinylidene fluoride. The plasticizer can be any one of phthalates, polyesters, citrates, phosphates and epoxy soybean oils.

[0118] The hot melt adhesive used in the present technical solution adopts terminal hydroxyl polycyclic epoxy compounds and terminal isocyanate polyurethane prepolymers to prepare epoxy polyurethane, which is then formulated with polyamine compounds to form a polyurethane adhesive, thereby enabling it to be fused. Since it combines the characteristics of polyurethane and epoxy resin, epoxy polyurethane generally has good mechanical properties, including strength and toughness. At the same time, since it contains both urethane and epoxy groups, epoxy polyurethane generally exhibits excellent adhesion.

[0119] See also Figure 1-8 The present invention provides an embodiment: a method for preparing a fireproof composite expansion sheet:

[0120] The following steps are involved:

[0121] S1: Material Selection

[0122] According to the actual performance requirements of the high-sealing composite expansion sheet, the specific material to be added is determined;

[0123] S2: Material Handling

[0124] Pre-treat each material and mix the heat-sensitive organic-inorganic composite powder that needs to be pre-mixed;

[0125] S3: Stirring and mixing

[0126] Use a high-speed mixer to mix the materials waiting to be mixed;

[0127] S4: Extrusion shaping

[0128] Use an extruder to extrude the stirred material at a certain temperature;

[0129] S5: Cooling and solidification

[0130] The plasticized expansion sheet is placed in a water cooling circulation device and cooled by water cooling;

[0131] S6: Cutting and forming

[0132] Using cutting tools or forming machinery, the expansion sheet is cut into the desired shape and size;

[0133] S7: Sampling and testing

[0134] The generated expansion sheets are taken out by a sampling method for independent performance testing, and the performance of the batch of expansion sheets is determined based on the test data.

[0135] S1 material selection is mainly used to determine the raw material components of the processing batch, including the following steps:

[0136] S101: Finished product performance indicators

[0137] Determine the actual finished product performance requirements and use them as the testing indicators in S7;

[0138] S102: Raw material inspection

[0139] Sampling and testing the raw materials according to the ingredient content labels, and determining whether the raw materials meet the production and processing requirements;

[0140] S103: Raw material ratio

[0141] Determine the specific amount of each component in the raw material according to the actual finished product demand;

[0142] S104: Arrangement Processing

[0143] According to the order in which the raw materials are added into the high-speed mixer, the raw materials are discharged to the feeding rack in order.

[0144] S2 material processing is used to pre-process the raw materials so that they can meet the mixing requirements, including the following steps:

[0145] S201: Indicator Designation

[0146] Determine the delivery requirements for each group of materials, including temperature, raw material particle size and state;

[0147] S202: Raw material preheating

[0148] Use a heating stirrer to preheat the raw materials and reduce the agglomeration of the powdered raw materials due to moisture absorption;

[0149] S203: Vibration screening

[0150] Use a standard mesh vibrating screen to screen the raw material particle size, and crush the materials that do not meet the particle size;

[0151] S204: Mixed processing

[0152] Metal powder, metal oxide powder, conductive polymer powder, coupling agent and auxiliary material are sequentially added into the reaction kettle, and the stirring speed is maintained at 1000-2000 rpm for low-speed mixing for 2-5 minutes to obtain a mixed thermosensitive organic-inorganic composite powder.

[0153] S3 stirring and mixing requires real-time monitoring of the temperature and reaction state during the stirring process, including the following steps:

[0154] S301: Temperature Control

[0155] A heating component and a cooling component are arranged inside the high-speed mixer, and the working states of the heating component and the cooling component are controlled by a temperature control terminal;

[0156] When the infrared temperature measuring device detects that there is a temperature difference inside the stirring and mixing device that exceeds the set threshold, the system will increase the stirring rate of the stirring device and at the same time control the operation of the heating device and the cooling device of the independent internal blocks so that the temperatures of various areas inside the stirring device tend to be the same, thereby avoiding different reaction rates between materials due to uneven temperatures.

[0157] S302: Temperature monitoring

[0158] An infrared temperature measuring device is installed at the high-speed mixer to monitor the regional temperature inside the high-speed mixer in real time;

[0159] S303: Chart conversion

[0160] Generate a corresponding time-temperature line graph based on the temperature detection result of the infrared temperature measuring device;

[0161] S304: Air pressure control

[0162] The air pressure status inside the equipment is monitored in real time through the air pressure detection device, and when the air pressure inside the equipment is insufficient, neon gas is filled into it to replenish the air pressure to the standard range.

[0163] S4 extrusion shaping is mainly used to inject the mixed material into the mold for preliminary shaping and extrusion:

[0164] S401: Vacuum injection

[0165] Use a vacuum machine to evacuate the injection port and ensure that the air pressure there is -0.04Mpa;

[0166] S402: Equipment Tuning

[0167] Set the extruder screw rotation speed and keep the internal mixed material extruded at a constant speed;

[0168] S403: Temperature detection

[0169] Control the extrusion temperature of the extruder and keep the temperature during extrusion to meet the requirements.

[0170] In S5 cooling and solidification, the water cooling state is mainly controlled by controlling the temperature of the water cooling liquid inside the water cooling pipe, including the following steps:

[0171] S501: Cooling test

[0172] The temperature of the composite expansion sheet in the cooling mold is detected by an infrared temperature measuring device, and the temperature of the coolant in the water cooling device is detected by a control end of the water cooling device;

[0173] During the detection process, different characteristic areas will be set according to the internal shapes of different stirring and mixing devices, and the temperature at the center of each partition will be detected by an infrared temperature measuring device to obtain the average temperature of the area as the block temperature judgment standard.

[0174] S502: Curve setting

[0175] The estimated cooling temperature curve is set according to the actual cooling temperature requirement, and the infrared temperature measuring device generates a corresponding temperature change curve for the temperature detected at the composite expansion sheet;

[0176] S503: Curve comparison

[0177] The processing system compares the set temperature curve C_1 and the temperature curve C_2 obtained by time detection, and calculates the similarity through the Euclidean distance between the n feature points in the two sets of curves. The algorithm formula steps are as follows:

[0178] [C_1={(x_{1,1},y_{1,1}),(x_{1,2},y_{1,2}),\ldots,(x_{1,n},y_{1,n})}];

[0179] [C_2={(x_{2,1},y_{2,1}),(x_{2,2},y_{2,2}),\ldots,(x_{2,n},y_{2,n})}];

[0180] Calculate the difference between the horizontal and vertical axes to get ((\Deltax_i,\Deltay_i)), then square the difference of each point to get ((\Deltax_i)^2) and ((\Deltay_i)^2), add the squared differences to get (\sum_{i=1}^{n}(\Deltax_i)^2+(\Deltay_i)^2), and finally take the square root of the value to get the final Euclidean distance. The smaller the value of the Euclidean distance, the more similar the curves are, and vice versa, the larger the value, the more dissimilar the curves are.

[0181] By comparing the calculated value with the threshold set in the system, when the value of the Euclidean distance is less than the set threshold, the cooling process will be defaulted to conform to the set curve. When the value of the Euclidean distance is greater than the set threshold, the system will control the water cooling device to adjust the internal coolant temperature according to the difference between the value of the Euclidean distance and the preset value, thereby increasing or decreasing the water cooling efficiency and maintaining the ability to complete the water cooling process in a relatively gentle process.

[0182] S504: Cooling control

[0183] Finally, the curve similarity data obtained based on the Euclidean distance is used to determine whether the current cooling state meets the set temperature change requirements. If the similarity is less than the set threshold, the water cooling device will systematically intervene in its cooling process by controlling the internal coolant temperature.

[0184] The S6 cutting and forming will perform standardized cutting processing on the shape of the composite expansion sheet after cooling, including the following steps:

[0185] S601: Standard Modeling

[0186] A standardized composite expansion sheet model is established through 3D software and imported into the system;

[0187] S602: Automated cutting

[0188] The composite expansion sheet obtained by modeling is trimmed and cut using automated cutting equipment.

[0189] The S7 sampling test will be carried out according to the 100:3 standard, including the following steps:

[0190] S701: Appearance inspection

[0191] The appearance of the finished composite expansion sheet is inspected through model matching, and the degree of edge burrs is inspected;

[0192] S702: Expansion coefficient

[0193] The expansion coefficient parameters of the composite expansion sheet are tested, and the specific calculation method of the expansion coefficient α is as follows:

[0194] [α=\frac{{\DeltaL}}{{L_0\cdot\DeltaT}}];

[0195] in:

[0196] (α) is the linear expansion coefficient (unit: 1 / degree Celsius or 1 / Kelvin);

[0197] (\DeltaL) is the change in length (usually in meters);

[0198] (L_0) is the length of the object at the initial temperature (usually in meters);

[0199] (\DeltaT) is the temperature change (in degrees Celsius or Kelvin);

[0200] When performing the expansion coefficient test, it is necessary to obtain the length change of the composite expansion sheet by changing the ambient temperature. At the same time, the length change is a generalized length change, including length, width, and thickness data. Therefore, its linear expansion coefficient is calculated through the change state of its overall volume, thereby ensuring that the obtained linear expansion coefficient value is relatively accurate, and this value can be used as a reference standard for judging the quality of the composite expansion sheet.

[0201] S703: Impact pressure detection

[0202] The composite expansion sheet is clamped and fixed, and its impact resistance and pressure bearing capacity are tested through external pressure-adjustable equipment;

[0203] S704: Report Generation

[0204] Generate a corresponding test report based on the data obtained from the actual test, and compare it with the performance requirements set in S1 to obtain the final product quality judgment.

[0205] According to GB14907, 4 layers of expansion sheets are pasted on the surface of Q235 steel with a size of 500×500×6mm, and the adhesive uses the hot melt adhesive in the raw materials, so that the total thickness of the product reaches 19.1mm. The thermal insulation efficiency is tested based on this standard. The time taken for the average surface temperature of the substrate to reach 500℃ is 111 minutes, which has a very good fireproof and thermal insulation effect.

[0206] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fireproof composite expansion sheet, comprising a high sealing expansion sheet, a heat-sensitive adhesive coated on one side of the sheet, and wax paper composited with the heat-sensitive adhesive, characterized in that: The raw materials include EVA, AC foaming agent 20-25 parts, lead stearate 65-75 parts, polyethylene wax 1-3 parts, polyvinyl chloride 7-10 parts, EPDM rubber 3-5 parts, silicone rubber 5-8 parts, antioxidant 0.2-1.5 parts, polymer 12-17 parts, thermosensitive organic-inorganic composite powder 0.5-1 parts, plasticizer, stabilizer, lubricant, hot melt adhesive, processing aid, filler are 0.3-1 parts each; The thermosensitive organic-inorganic composite powder is obtained by reacting metal powder, metal oxide powder, conductive polymer powder, coupling agent and auxiliary agent, the polymer is any one of chloroprene rubber, polypropylene, polyvinylidene chloride, polytetrafluoroethylene and polyvinylidene fluoride, and the plasticizer is any one of phthalate esters, polyesters, citrate esters, phosphate esters and epoxy soybean oil; The method for preparing the high sealing expansion sheet comprises the following steps: S1: Material Selection According to the actual performance requirements of the high sealing expansion sheet, the specific material to be added is determined; S2: Material Handling Pre-treat each material and mix the heat-sensitive organic-inorganic composite powder that needs to be pre-mixed; S3: Stirring and mixing Use a high-speed mixer to mix the materials waiting to be mixed; S4: Extrusion shaping Use an extruder to extrude the stirred material at a certain temperature and high temperature; S5: Cooling and solidification The shaped high sealing expansion sheet is placed in a water cooling circulation device and cooled by water cooling; S6: Cutting and forming Using a cutting tool or a forming machine, the high sealing expansion sheet is cut into the desired shape and size; S7: Sampling and testing The generated high sealing expansion sheet is taken out by a sampling method for independent performance testing, and the performance of the high sealing expansion sheet is determined according to the test data; The cooling and curing in S5 mainly controls the water cooling state by controlling the temperature of the water cooling liquid inside the water cooling pipe, and includes the following steps: S501: Cooling test The temperature of the high sealing expansion sheet in the cooling mold is detected by an infrared temperature measuring device, and the temperature of the coolant in the water cooling device is detected by the control end of the water cooling device; S502: Curve setting The estimated cooling temperature curve is set according to the actual cooling temperature requirement, and the infrared temperature measuring device generates a corresponding temperature change curve for the detected temperature at the high sealing expansion sheet; S503: Curve comparison The processing system compares the set temperature curve C_1 and the temperature curve C_2 obtained by time detection, and calculates the similarity by the Euclidean distance between the n feature points in the two sets of curves. The algorithm formula steps are as follows: C_1={(x_{1,1},y_{1,1}),(x_{1,2},y_{1,2}),\ldots,(x_{1,n},y_{1,n})}; C_2={(x_{2,1},y_{2,1}),(x_{2,2},y_{2,2}),\ldots,(x_{2,n},y_{2,n})}; Calculate the difference between the horizontal and vertical axes to get (\Deltax_i,\Deltay_i), then square the difference of each point to get (\Deltax_i)^2 and (\Deltay_i)^2, add the squared differences to get \sum_{i=1}^{n}(\Deltax_i)^2+(\Deltay_i)^2, and finally take the square root of the value to get the final Euclidean distance. The smaller the value of the Euclidean distance, the more similar the curves are, and vice versa, the larger the value, the more dissimilar the curves are; S504: Cooling control Finally, the curve similarity data obtained based on the Euclidean distance is used to determine whether the current cooling state meets the set temperature change requirements. If the similarity is less than the set threshold, the water cooling device will systematically intervene in its cooling process by controlling the internal coolant temperature.

2. A fireproof composite expansion sheet according to claim 1, characterized in that: The S6 cutting and forming will perform standardized cutting processing on the shape of the high sealing expansion sheet after cooling, including the following steps: S601: Standard Modeling Establish a standardized high sealing expansion sheet model through 3D software and import it into the system; S602: Automated cutting The high sealing expansion sheet shape obtained by modeling is trimmed and cut by automated cutting equipment.

3. A fireproof composite expansion sheet according to claim 1, characterized in that: The S1 material selection is mainly used to determine the raw material components, including the following steps: S101: Finished product performance indicators Determine the actual finished product performance requirements and use them as the testing indicators in S7; S102: Raw material inspection Sampling and testing the raw materials according to the ingredient content labels, and determining whether the raw materials meet the production and processing requirements; S103: Raw material ratio Determine the specific amount of each component in the raw material according to the actual finished product demand; S104: Arrangement Processing According to the order in which the raw materials are added into the high-speed mixer, the raw materials are discharged to the feeding rack in order.

4. A fireproof composite expansion sheet according to claim 1, characterized in that: The S2 material processing is used to pre-process the raw materials so that they can meet the stirring and mixing requirements, and includes the following steps: S201: Indicator Designation Determine the delivery requirements for each group of materials, including temperature, raw material particle size and state; S202: Raw material preheating Use a heating stirrer to preheat the raw materials and reduce the agglomeration of the powdered raw materials due to moisture absorption; S203: Vibration screening Use a standard mesh vibrating screen to screen the raw material particles, and crush the materials that do not meet the particle size; S204: Mixed processing Metal powder, metal oxide powder, conductive polymer powder, coupling agent and auxiliary material are sequentially added into the reaction kettle, and the stirring speed is maintained at 1000-2000 rpm for 2-5 minutes to obtain a mixed thermosensitive organic-inorganic composite powder.

5. The fireproof composite expansion sheet according to claim 1, characterized in that: The step S3 of stirring and mixing requires real-time monitoring of the temperature and reaction state during the stirring process, including the following steps: S301: Temperature Control A heating component and a cooling component are arranged inside the high-speed mixer, and the working states of the heating component and the cooling component are controlled by a temperature control terminal; S302: Temperature monitoring An infrared temperature measuring device is installed at the high-speed mixer to monitor the regional temperature inside the high-speed mixer in real time; S303: Chart conversion Generate a corresponding time-temperature line graph based on the temperature detection result of the infrared temperature measuring device; S304: Air pressure control The air pressure status inside the equipment is monitored in real time through the air pressure detection device, and neon gas is filled into the equipment to replenish the air pressure to the standard range when the air pressure inside the equipment is insufficient.

6. A fireproof composite expansion sheet according to claim 1, characterized in that: The S4 extrusion shaping is mainly used to inject the mixed material into the mold for preliminary shaping and extrusion of its shape: S401: Vacuum injection Use a vacuum machine to evacuate the injection port and ensure that the air pressure there is -0.04Mpa; S402: Equipment Tuning Set the extruder screw rotation speed and keep the internal mixed material extruded at a uniform speed; S403: Temperature monitoring Control the extrusion temperature of the extruder and keep the temperature during extrusion to meet the requirements.

7. A fireproof composite intumescent sheet according to claim 1, characterized in that: The S7 sampling test will be carried out according to the 100:3 standard, including the following steps: S701: Appearance inspection The appearance of the finished high sealing expansion sheet is inspected through model matching, and the degree of edge burr is inspected; S702: Expansion coefficient The expansion coefficient parameters of the high sealing expansion sheet are tested, and the specific calculation method of the expansion coefficient α is as follows: α=\frac{{\DeltaL}}{{L_0\cdot\DeltaT}}; in: α is the linear expansion coefficient, unit: 1 / degree Celsius or 1 / Kelvin; \DeltaL is the change in length in meters; L_0 is the length of the object at the initial temperature, in meters; \DeltaT is the temperature change in degrees Celsius or Kelvin; S703: Impact pressure detection The high sealing expansion sheet is clamped and fixed, and its impact resistance and pressure bearing capacity are tested through external pressure-adjustable equipment; S704: Report Generation Generate a corresponding test report based on the data obtained from the actual test, and compare it with the performance requirements set in S1 to obtain the final product quality judgment.

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