A rigid foam material and preparation method thereof

Abstract

The present invention relates to the technical field of foaming materials, and in particular to a rigid foaming material and a preparation method thereof. The method comprises: step S1, conveying foaming raw materials into a stirring tank, stirring and outputting liquid mixed foaming raw materials; step S2, conveying the liquid mixed foaming raw materials into a foaming mold, heating and outputting finished foaming materials; step S3, a central control module calculating the variance of the density of the finished foaming material to determine the stability of the foaming material preparation process; step S4, the central control module initially adjusts the running speed of a stirring component in a vertical direction, or adjusts the feeding speed of the foaming raw materials according to the internal air pressure of the stirring tank; step S5, the central control module secondarily adjusts the running speed of the stirring component in the vertical direction according to the average compression strength of the finished foaming material. The present invention realizes the improvement of the preparation stability and preparation accuracy of the rigid foaming material.

Description

Technical Field

[0001] The invention relates to the technical field of foaming materials, and in particular to a rigid foaming material and a preparation method thereof. Background Art

[0002] Most polyurethane rigid foams are closed-cell structures, with excellent properties such as good insulation, light weight, high specific strength, and convenient construction. They also have the characteristics of sound insulation, shockproof, electrical insulation, heat resistance, cold resistance, and solvent resistance. They are widely used in refrigerator and freezer box insulation layers, cold storage, refrigerated trucks and other insulation materials, buildings, storage tanks and pipeline insulation materials, and a small amount is used in non-insulating occasions, such as imitation wood, packaging materials, etc. Generally speaking, lower-density polyurethane rigid foams are mainly used as thermal insulation materials, and higher-density polyurethane rigid foams can be used as structural materials.

[0003] Chinese Patent Publication No.: CN113603977A discloses a high-hardness micro-foam material and a preparation method thereof, comprising polymethyl methacrylate, polystyrene resin, compatibilizer, foaming agent, fumed silica, basalt fiber, crosslinking agent and crosslinking agent auxiliary agent, wherein fumed silica plays a role in improving weather resistance and scratch resistance in the formulation system of the foam material, and can also improve the bonding strength between the micro-foam material and the substrate, and the addition of basalt fiber can greatly increase the hardness of the micro-foam material. It can be seen that the high-hardness micro-foam material and the preparation method thereof have the following problems: the quality of the prepared foam material is reduced due to the inaccurate judgment of the stability of the foam material preparation process reflected by the uneven density of the foam material during the preparation process. Summary of the invention

[0004] To this end, the present invention provides a rigid foam material and a preparation method thereof, so as to overcome the problem in the prior art that the quality of the prepared foam material is reduced due to inaccurate judgment of the stability of the foam material preparation process reflected by the uneven density of the foam material during the preparation process.

[0005] To achieve the above-mentioned purpose, the present invention provides a method for preparing a rigid foam material, comprising: step S1, conveying a corresponding weight of foaming raw materials to a stirring tank provided on a stirrer through a feeding device, and stirring the foaming raw materials using a stirring component provided in the stirrer to output a liquid mixed foaming raw material; step S2, conveying the liquid mixed foaming raw material to a foaming mold, and heating the foaming mold using a heating device so that the foaming mold outputs a finished foaming material; step S3, a central control module controls a foaming material density tester to detect the density of the finished foam material of several detection cycles, and calculates the variance of the density of the finished foam material according to the density detection result , and determine the stability of the foaming material preparation process according to the variance of the density of the finished foaming material; step S4, when the central control module determines that the stability of the foaming material preparation process is lower than the allowable range, the central control module performs an initial adjustment on the vertical stirring component operation speed, or adjusts the feeding rate of the foaming raw material according to the internal air pressure of the stirring tank; step S5, when the central control module completes the initial adjustment of the vertical stirring component operation speed, the central control module performs a secondary adjustment on the vertical stirring component operation speed according to the average compression strength of the finished foaming material, or adjusts the stirring motor speed according to the fluctuation amplitude of the liquid mixed foaming raw material.

[0006] Furthermore, the central control module determines the stability of the foam material preparation process according to the variance of the density of the finished foam material.

[0007] When the variance of the density of the finished foam material satisfies the preset first variance condition and the preset second variance condition, the central control module determines that the stability of the foam material preparation process is lower than the allowable range, wherein:

[0008] The central control module determines to increase the running speed of the stirring component in the vertical direction under a preset first variance condition;

[0009] The central control module preliminarily determines that the degree of gas precipitation exceeds the allowable range under the preset second variance condition, and performs a secondary determination on the degree of gas precipitation according to the gas pressure inside the mixing tank;

[0010] Among them, the preset first variance condition is that the variance of the density of the finished foam material is greater than the preset first variance and less than or equal to the preset second variance; the preset second variance condition is that the variance of the density of the finished foam material is greater than the preset second variance; the preset first variance is less than the preset second variance.

[0011] Furthermore, the central control module determines several adjustment methods for increasing the operating speed of the stirring component in the vertical direction according to the difference between the variance of the density of the finished foaming material and the preset first variance under the preset first variance condition, wherein each adjustment method has a different adjustment magnitude for increasing the operating speed of the stirring component in the vertical direction.

[0012] Furthermore, the central control module performs a secondary determination on the degree of gas precipitation according to the gas pressure inside the stirring tank under the preset second variance condition, wherein:

[0013] The central control module determines for the second time that the gas precipitation degree exceeds the allowable range under the preset air pressure condition, and adjusts the feeding rate of the foaming raw material;

[0014] Wherein, the preset air pressure condition is that the air pressure inside the stirring tank is greater than the preset air pressure.

[0015] Furthermore, the central control module determines several adjustment methods for increasing the feed rate of the foaming raw material under preset air pressure conditions according to the difference between the air pressure inside the stirring tank and the preset air pressure, wherein each rate adjustment method has a different degree of adjustment for increasing the feed rate of the foaming raw material.

[0016] Further, when the initial adjustment of the vertical stirring component running speed is completed, the central control module determines whether the effectiveness of stirring is within the allowable range according to the average compression strength of the finished foaming material, wherein:

[0017] The central control module determines that the effectiveness of stirring is lower than the allowable range under the preset first compression strength condition and the preset second compression strength condition, wherein:

[0018] The central control module determines to perform secondary adjustment on the running speed of the stirring assembly in the vertical direction under the preset first compression strength condition;

[0019] The central control module preliminarily determines that the stability of the stirring tank is lower than the allowable range under the preset second compression strength condition, and performs a secondary determination on the stability of the stirring tank according to the fluctuation amplitude of the liquid mixed foaming raw material;

[0020] Among them, the preset first compression strength condition is that the average compression strength of the finished foam material is greater than the preset first compression strength and less than or equal to the preset second compression strength; the preset second compression strength condition is that the average compression strength of the finished foam material is greater than the preset second compression strength; the preset first compression strength is less than the preset second compression strength.

[0021] Furthermore, the central control module determines several secondary adjustment methods for increasing the operating speed of the stirring component in the vertical direction according to the difference between the average compression strength of the finished foaming material and the preset first compression strength under the preset first compression strength condition, wherein each secondary adjustment method has a different adjustment degree for increasing the operating speed of the stirring component in the vertical direction.

[0022] Furthermore, the central control module performs a secondary determination on the stability of the stirring tank according to the fluctuation amplitude of the liquid mixed foaming raw material under the preset second compression strength condition, wherein:

[0023] The central control module determines that the stability of the mixing tank is below the allowable range under the preset amplitude condition;

[0024] Wherein, the preset amplitude condition is that the fluctuation amplitude of the liquid mixed foaming raw material is greater than the preset amplitude.

[0025] Furthermore, the central control module determines several adjustment methods for reducing the speed of the stirring motor according to the difference between the fluctuation amplitude of the liquid mixed foaming raw material and the preset amplitude under the preset amplitude condition, wherein each speed adjustment method has a different adjustment degree for reducing the speed of the stirring motor.

[0026] The invention also provides a rigid foaming material, the components of which include: polyether 480, catalyst A33, catalyst DMEA, silicone oil K888, triethanolamine, tap water, ethylene glycol, and foaming agent F-580.

[0027] Compared with the prior art, the beneficial effect of the present invention lies in that the method of the present invention detects the preparation process of the rigid foaming material and adjusts the relevant equipment by setting steps S1-S5, thereby improving the quality of the rigid foaming material, and the central control module increases the running speed of the stirring component in the vertical direction according to the variance of the density of the finished foaming material, thereby increasing the stirring degree and improving the reaction efficiency, or, according to the internal air pressure of the stirring tank, the feeding rate of the foaming raw material is adjusted, and the overflow of the raw material and the evaporation of water are reduced by increasing the feeding rate of the foaming raw material, thereby increasing the stirring vortex and reducing the reaction temperature, and completing the When the operating speed of the stirring component in the vertical direction is adjusted for the first time, due to the accelerated position change speed of the stirring component, the stirring degree at some positions is reduced, resulting in incomplete utilization of the raw materials. The central control module conducts a second adjustment to the operating speed of the stirring component in the vertical direction according to the average compression strength of the finished foaming material, thereby achieving sufficient stirring of the raw materials by the stirring component, or adjusting the speed of the stirring motor according to the fluctuation amplitude of the liquid mixed foaming raw materials. By reducing the speed of the stirring motor, the incomplete utilization of the raw materials caused by the excessive swinging amplitude of the foaming raw materials is reduced, thereby achieving improved stability and accuracy in the preparation of rigid foaming materials.

[0028] Furthermore, the method of the present invention sets a preset first variance and a preset second variance, and the central control module determines the preparation stability of the foaming material according to the variance of the density of the finished foaming material. In the process of preparing the foaming material, incomplete reaction caused by insufficient stirring of the raw materials will reduce the preparation stability of the finished foaming material, which is specifically manifested in that the density between individual finished foaming materials has a large difference. By setting a preset variance difference, a preset first rate adjustment coefficient and a preset second rate adjustment coefficient, the central control module adjusts the vertical stirring component operation speed according to the difference between the variance of the density of the finished foaming material and the preset first variance. By increasing the vertical stirring component operation speed, the foaming raw materials are uniformly stirred to achieve uniform foaming of the liquid mixed foaming raw materials in the foaming mold, thereby further improving the preparation stability and preparation accuracy of the rigid foaming material.

[0029] Furthermore, the method of the present invention sets a preset air pressure under a preset second variance condition, and the central control module performs a secondary judgment on the degree of gas precipitation according to the air pressure inside the stirring tank. In the process of stirring the foaming raw materials, due to the occurrence of chemical reactions and the operation of the stirring component, the temperature and air pressure in the stirring tank will change accordingly. The increase in air pressure caused by the temperature will prompt the gas in the foaming raw materials to escape, causing the reaction to cause the loss of raw materials. By setting a preset air pressure difference, a preset first feed rate adjustment coefficient and a preset second feed rate adjustment coefficient, the central control module adjusts the feed rate of the foaming raw materials according to the difference between the air pressure inside the stirring tank and the preset air pressure. By increasing the feed rate of the foaming raw materials, the overall reaction time is shortened, thereby further improving the preparation stability and preparation accuracy of the rigid foaming material. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is an overall flow chart of the method for preparing a rigid foam material according to an embodiment of the present invention;

[0031] Figure 2 This is a specific flow chart of step S3 of the method for preparing a rigid foam material according to an embodiment of the present invention;

[0032] Figure 3 This is a specific flow chart of step S4 of the method for preparing a rigid foam material according to an embodiment of the present invention;

[0033] Figure 4 This is a specific flow chart of step S5 of the method for preparing a rigid foam material according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0036] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively an overall flow chart of the method for preparing a rigid foam material according to an embodiment of the present invention, a specific flow chart of step S3, a specific flow chart of step S4, and a specific flow chart of step S5. A method for preparing a rigid foam material according to the present invention comprises:

[0037] Step S1, delivering a corresponding weight of foaming raw material to a stirring tank provided on a stirrer through a feeding device, and stirring the foaming raw material using a stirring component provided in the stirrer to output a liquid mixed foaming raw material;

[0038] Step S2, conveying the liquid mixed foaming raw material into a foaming mold, and using a heating device to heat the foaming mold so that the foaming mold outputs a finished foaming material;

[0039] Step S3, the central control module controls the foam material density tester to test the density of the finished foam material in several test cycles, calculates the density variance of the finished foam material according to the density test result, and determines the stability of the foam material preparation process according to the density variance of the finished foam material;

[0040] Step S4, when the central control module determines that the stability of the foaming material preparation process is lower than the allowable range, the central control module initially adjusts the running speed of the stirring assembly in the vertical direction, or adjusts the feeding rate of the foaming raw material according to the internal air pressure of the stirring tank;

[0041] Step S5, when the central control module completes the initial adjustment of the vertical stirring component operating speed, the central control module performs a secondary adjustment on the vertical stirring component operating speed according to the average compression strength of the finished foaming material, or adjusts the stirring motor speed according to the fluctuation amplitude of the liquid mixed foaming raw material.

[0042] Specifically, the calculation formula for the average compressive strength of the finished foam material is:

[0043]

[0044] Among them, Q is the average compressive strength of the finished foam material, q ais the compressive strength of the ath finished foam material, n is the number of finished foam materials, and n is a natural number greater than or equal to 1.

[0045] Specifically, the fluctuation amplitude of the liquid mixed foaming raw material is the difference between the maximum height and the minimum height of the foaming raw material being swung when the stirring component stirs the foaming raw material in the stirring tank.

[0046] Specifically, the variance of the density of the finished foam material is the average density of the finished foam material for several test cycles obtained after the foam material density tester tests the density of the finished foam material for several test cycles, and the variance of the density of the finished foam material is obtained based on the average density of the finished foam material for several test cycles. It can be understood that the method for calculating the variance of the density of the finished foam material is a technical means commonly used by technical personnel in this field, and will not be elaborated here.

[0047] Specifically, the mixer comprises:

[0048] A stirring assembly, used to stir the foaming raw material, comprising a telescopic rod for adjusting the running amplitude of the stirring assembly in the vertical direction and a dispersion plate connected to the telescopic rod and rotating to stir the foaming raw material;

[0049] A stirring tank connected to the stirring assembly, comprising an air pressure sensor arranged on the inner wall of the stirring tank for detecting the internal air pressure of the stirring tank, a feed pipe arranged on the top of the stirring tank for conveying foaming raw materials, and an electric valve arranged on the feed pipe for controlling the feed rate by changing the opening;

[0050] The stirring motor is connected to the stirring component to provide power for the stirring component to operate.

[0051] Specifically, the specific steps of step S3 include:

[0052] Step S31, the central control module controls the foam material density tester to test the density of the finished foam material in several test cycles;

[0053] Step S32, the central control module calculates the density variance of the finished foam material according to the test result of the foam material density tester;

[0054] Step S33: the central control module determines the stability of the foam material preparation process according to the variance of the density of the finished foam material.

[0055] Specifically, the specific steps of step S4 include:

[0056] Step S41, the central control module determines that the stability of the foaming material preparation process is lower than the allowable range under the preset first variance condition and the preset second variance condition;

[0057] Step S42, the central control module determines to increase the vertical stirring component operation speed under the preset first variance condition, or preliminarily determines that the gas precipitation degree exceeds the allowable range under the preset second variance condition;

[0058] Step S43, when it is preliminarily determined that the degree of gas evolution exceeds the allowable range, the central control module adjusts the feed rate of the foaming raw material according to the gas pressure inside the stirring tank.

[0059] Specifically, the specific steps of step S5 include:

[0060] Step S51, when the initial adjustment of the vertical stirring component running speed is completed, the central control module determines the effectiveness of stirring according to the average compression strength of the finished foaming material;

[0061] Step S52, the central control module performs secondary adjustment on the vertical stirring component running speed under the preset first compression strength condition, or preliminarily determines that the stability of the stirring tank is lower than the allowable range under the preset second compression strength condition;

[0062] Step S53, when it is determined that the stability of the stirring tank is lower than the allowable range, the central control module adjusts the speed of the stirring motor according to the fluctuation amplitude of the liquid mixed foaming raw material.

[0063] The method of the present invention detects the preparation process of the rigid foaming material and adjusts the relevant equipment by setting steps S1-S5, thereby improving the quality of the rigid foaming material. The central control module increases the running speed of the stirring component in the vertical direction according to the variance of the density of the finished foaming material, thereby increasing the stirring degree and improving the reaction efficiency, or, adjusts the feeding rate of the foaming raw material according to the internal air pressure of the stirring tank, reduces the overflow of the raw material and the evaporation of water by increasing the feeding rate of the foaming raw material, thereby increasing the stirring vortex and reducing the reaction temperature, and, when the initial adjustment of the running speed of the stirring component in the vertical direction is completed, due to the accelerated position change speed of the stirring component, the stirring degree of some positions is reduced, resulting in incomplete utilization of the raw materials, the central control module performs a secondary adjustment on the running speed of the stirring component in the vertical direction according to the average compression strength of the finished foaming material, thereby achieving sufficient stirring of the raw materials by the stirring component, or, adjusts the speed of the stirring motor according to the fluctuation amplitude of the liquid mixed foaming raw material, reduces the incomplete utilization of the raw materials due to the excessive swing amplitude of the foaming raw material by reducing the speed of the stirring motor, and achieves the improvement of the preparation stability and preparation accuracy of the rigid foaming material.

[0064] Please continue reading Figure 3 As shown, the central control module determines the stability of the foam material preparation process according to the variance of the density of the finished foam material.

[0065] When the variance of the density of the finished foam material satisfies the preset first variance condition and the preset second variance condition, the central control module determines that the stability of the foam material preparation process is lower than the allowable range, wherein:

[0066] The central control module determines to increase the running speed of the stirring component in the vertical direction under a preset first variance condition;

[0067] The central control module preliminarily determines that the degree of gas precipitation exceeds the allowable range under the preset second variance condition, and performs a secondary determination on the degree of gas precipitation according to the gas pressure inside the mixing tank;

[0068] Among them, the preset first variance condition is that the variance of the density of the finished foam material is greater than the preset first variance and less than or equal to the preset second variance; the preset second variance condition is that the variance of the density of the finished foam material is greater than the preset second variance; the preset first variance is less than the preset second variance.

[0069] Specifically, the gas evolution degree refers to the gas evolution degree of the foaming raw material in the stirring tank.

[0070] Please continue reading Figure 3 As shown, the central control module determines several adjustment methods for increasing the running speed of the stirring component in the vertical direction according to the difference between the variance of the density of the finished foaming material and the preset first variance under the preset first variance condition, wherein each adjustment method has a different adjustment magnitude for increasing the running speed of the stirring component in the vertical direction.

[0071] The first adjustment method is that the central control module uses a preset first rate adjustment coefficient to adjust the vertical running rate of the stirring component to a first rate under a preset first variance difference condition;

[0072] The second adjustment method is that the central control module uses a preset second rate adjustment coefficient to adjust the vertical running rate of the stirring component to a second rate under a preset second variance difference condition;

[0073] Among them, the preset first variance difference condition is that the difference between the variance of the density of the finished foam material and the preset first variance is less than or equal to the preset variance difference; the preset second variance difference condition is that the difference between the variance of the density of the finished foam material and the preset first variance is greater than the preset variance difference; the preset first rate adjustment coefficient is less than the preset second rate adjustment coefficient.

[0074] Specifically, the variance of the density of the finished foaming material is recorded as X, the preset first variance is recorded as X1, the preset second variance is recorded as X2, the difference between the variance of the density of the finished foaming material and the preset first variance is recorded as △X, △X is set as X-X1, the preset variance difference is recorded as △X0, the preset first rate adjustment coefficient is recorded as α1, the preset second rate adjustment coefficient is recorded as α2, wherein 1<α1<α2, the vertical operation rate of the stirring component is recorded as V, the vertical operation rate of the stirring component after adjustment is recorded as V', V' is set as V×αi, wherein αi is the preset i-th rate adjustment coefficient, and i is set as 1, 2.

[0075] The method of the present invention sets a preset first variance and a preset second variance, and the central control module determines the preparation stability of the foaming material according to the variance of the density of the finished foaming material. In the process of preparing the foaming material, the incomplete reaction caused by insufficient stirring of the raw materials will reduce the stability of the preparation of the finished foaming material, which is specifically manifested in that the density between the individual finished foaming materials has a large difference. By setting a preset variance difference, a preset first rate adjustment coefficient and a preset second rate adjustment coefficient, the central control module adjusts the vertical direction stirring component operation speed according to the difference between the variance of the density of the finished foaming material and the preset first variance. By increasing the vertical direction stirring component operation speed, the foaming raw materials are uniformly stirred to achieve uniform foaming of the liquid mixed foaming raw materials in the foaming mold, thereby further improving the preparation stability and preparation accuracy of the rigid foaming material.

[0076] Please continue reading Figure 3 As shown, the central control module performs a secondary determination on the degree of gas precipitation according to the gas pressure inside the mixing tank under the preset second variance condition, wherein:

[0077] The central control module determines for the second time that the gas precipitation degree exceeds the allowable range under the preset air pressure condition, and adjusts the feeding rate of the foaming raw material;

[0078] Wherein, the preset air pressure condition is that the air pressure inside the stirring tank is greater than the preset air pressure.

[0079] Please continue reading Figure 3 As shown, the central control module determines several adjustment methods for increasing the feed rate of the foaming raw material under the preset air pressure condition according to the difference between the air pressure inside the stirring tank and the preset air pressure, wherein each rate adjustment method has a different adjustment degree for increasing the feed rate of the foaming raw material.

[0080] The first rate adjustment method is that the central control module adjusts the feed rate of the foaming raw material to the first feed rate using a preset first feed rate adjustment coefficient under a preset first pressure difference condition;

[0081] The second rate adjustment method is that the central control module adjusts the feed rate of the foaming raw material to the second feed rate using a preset second feed rate adjustment coefficient under a preset second pressure difference condition;

[0082] Among them, the preset first air pressure difference condition is that the difference between the air pressure inside the stirring tank and the preset air pressure is less than or equal to the preset air pressure difference; the preset second air pressure difference condition is that the difference between the air pressure inside the stirring tank and the preset air pressure is greater than the preset air pressure difference; the preset first feed rate adjustment coefficient is less than the preset second feed rate adjustment coefficient.

[0083] Specifically, the air pressure inside the stirring tank is denoted as P, the preset air pressure is denoted as P0, the difference between the air pressure inside the stirring tank and the preset air pressure is denoted as △P, △P is set to P-P0, the preset air pressure difference is denoted as △P0, the preset first feed rate adjustment coefficient is denoted as β1, the preset second feed rate adjustment coefficient is denoted as β2, wherein 0<β1<β2<1, the feed rate of the foaming raw material is denoted as S, the adjusted feed rate of the foaming raw material is denoted as S', and S' is set to S×(1+βj), wherein βj is the preset jth feed rate adjustment coefficient, and j is set to 1, 2.

[0084] The method of the present invention sets a preset air pressure under a preset second variance condition, and the central control module performs a secondary judgment on the degree of gas precipitation according to the air pressure inside the stirring tank. In the process of stirring the foaming raw materials, due to the occurrence of chemical reactions and the operation of the stirring component, the temperature and air pressure in the stirring tank will change accordingly. The increase in air pressure caused by the temperature will prompt the gas in the foaming raw materials to escape, causing the reaction to cause the loss of raw materials. By setting a preset air pressure difference, a preset first feed rate adjustment coefficient and a preset second feed rate adjustment coefficient, the central control module adjusts the feed rate of the foaming raw materials according to the difference between the air pressure inside the stirring tank and the preset air pressure. By increasing the feed rate of the foaming raw materials, the overall reaction time is shortened, and the preparation stability and preparation accuracy of the rigid foaming material are further improved.

[0085] Please continue reading Figure 4 As shown, when the initial adjustment of the vertical stirring component running speed is completed, the central control module determines whether the effectiveness of stirring is within the allowable range according to the average compression strength of the finished foaming material, wherein:

[0086] The central control module determines that the effectiveness of stirring is lower than the allowable range under the preset first compression strength condition and the preset second compression strength condition, wherein:

[0087] The central control module determines to perform secondary adjustment on the running speed of the stirring assembly in the vertical direction under the preset first compression strength condition;

[0088] The central control module preliminarily determines that the stability of the stirring tank is lower than the allowable range under the preset second compression strength condition, and performs a secondary determination on the stability of the stirring tank according to the fluctuation amplitude of the liquid mixed foaming raw material;

[0089] Among them, the preset first compression strength condition is that the average compression strength of the finished foam material is greater than the preset first compression strength and less than or equal to the preset second compression strength; the preset second compression strength condition is that the average compression strength of the finished foam material is greater than the preset second compression strength; the preset first compression strength is less than the preset second compression strength.

[0090] Please continue reading Figure 4 As shown, the central control module determines several secondary adjustment methods for increasing the operating speed of the stirring component in the vertical direction according to the difference between the average compression strength of the finished foaming material and the preset first compression strength under the preset first compression strength condition, wherein each secondary adjustment method has a different adjustment size for increasing the operating speed of the stirring component in the vertical direction.

[0091] The first secondary adjustment method is that the central control module uses a preset third rate adjustment coefficient to secondary adjust the vertical running rate of the stirring component to a third rate under a preset first compression strength condition;

[0092] The second secondary adjustment method is that the central control module uses a preset fourth rate adjustment coefficient to secondary adjust the vertical running rate of the stirring assembly to a fourth rate under a preset second compression strength condition;

[0093] Among them, the preset first compression strength condition is that the difference between the average compression strength of the finished foam material and the preset first compression strength is less than or equal to the preset compression strength difference; the preset second compression strength condition is that the difference between the average compression strength of the finished foam material and the preset first compression strength is greater than the preset compression strength difference; the preset third rate adjustment coefficient is less than the preset fourth rate adjustment coefficient.

[0094] Specifically, the average compression strength of the finished foaming material is recorded as Q, the preset first compression strength is recorded as Q1, the preset second compression strength is recorded as Q2, the difference between the average compression strength of the finished foaming material and the preset first compression strength is recorded as △Q, △Q is set as Q-Q1, the preset compression strength difference is recorded as △Q0, the preset third rate adjustment coefficient is recorded as α3, the preset fourth rate adjustment coefficient is recorded as α4, wherein 0<α3<α4<1, the vertical running speed of the stirring component after the secondary adjustment is recorded as V", and V"=V'×(1-αk), wherein αk is the preset kth rate adjustment coefficient, and k is set as 3, 4.

[0095] Please continue reading Figure 4As shown, the central control module performs a secondary determination on the stability of the stirring tank according to the fluctuation amplitude of the liquid mixed foaming raw material under the preset second compression strength condition, wherein:

[0096] The central control module determines that the stability of the mixing tank is below the allowable range under the preset amplitude condition;

[0097] Wherein, the preset amplitude condition is that the fluctuation amplitude of the liquid mixed foaming raw material is greater than the preset amplitude.

[0098] Please continue reading Figure 4 As shown, the central control module determines several adjustment methods for reducing the speed of the stirring motor according to the difference between the fluctuation amplitude of the liquid mixed foaming raw material and the preset amplitude under the preset amplitude condition, wherein each speed adjustment method has a different adjustment degree for reducing the speed of the stirring motor.

[0099] The first speed adjustment method is that the central control module uses a preset second speed adjustment coefficient to adjust the stirring motor speed to a first speed under a preset first amplitude difference condition;

[0100] The second speed adjustment method is that the central control module adjusts the stirring motor speed to the second speed using a preset first speed adjustment coefficient under a preset second amplitude difference condition;

[0101] Among them, the preset first amplitude difference condition is that the difference between the fluctuation amplitude of the liquid mixed foaming raw material and the preset amplitude is less than or equal to the preset amplitude difference; the preset second amplitude difference condition is that the difference between the fluctuation amplitude of the liquid mixed foaming raw material and the preset amplitude is greater than the preset amplitude difference; the preset first speed adjustment coefficient is less than the preset second speed adjustment coefficient.

[0102] Specifically, the fluctuation amplitude of the liquid mixed foaming raw material is denoted as F, the preset amplitude is denoted as F0, the difference between the fluctuation amplitude of the liquid mixed foaming raw material and the preset amplitude is denoted as △F, △F is set to F-F0, the preset amplitude difference is denoted as △F0, the preset first speed adjustment coefficient is denoted as δ1, the preset second speed adjustment coefficient is denoted as δ2, wherein 0<δ1<δ2<1, the stirring motor speed is denoted as B, the adjusted stirring motor speed is denoted as B', and B'=B×δg is set, wherein δg is the preset g-th speed adjustment coefficient, and g=1,2.

[0103] The present invention also provides a rigid foaming material, the components and weight of which include: 70 kg of polyether (480), 0.7 kg of catalyst (A33), 1.2 kg of catalyst (DMEA), 0.7 kg of silicone oil (K888), 0.7 kg of triethanolamine, 2.5 kg of tap water, 1.5 kg of ethylene glycol, and 2.1 kg of foaming agent (F-580).

[0104] Example 1

[0105] In this embodiment 1, the preset variance difference △X0=0.3 (g / m 3 ) 2 , the first speed adjustment coefficient α1 is preset to be 1.1, the second speed adjustment coefficient α2 is preset to be 1.2, the vertical running speed of the stirring component V is 0.1 m / s,

[0106] In this embodiment 1, ΔX=0.02 (g / m 3 ) 2 , the central control module determines that △X<△X0, and uses α1 to adjust the vertical running speed of the stirring component. The adjusted vertical running speed of the stirring component is V'=0.1m / s×1.1=0.11m / s.

[0107] In this embodiment 1, after obtaining the difference between the variance of the density of the finished foaming material and the preset first variance, the central control module shown uses the corresponding adjustment coefficient to adjust the vertical operating speed of the stirring component, thereby increasing the vertical operating speed of the stirring component to increase the degree of reaction, thereby further improving the preparation stability and preparation accuracy of the rigid foaming material.

[0108] Example 2

[0109] In this Example 2, polyether (480), catalyst (A33), catalyst (DMEA), silicone oil (K888), triethanolamine, tap water, ethylene glycol, and foaming agent (F-580) are poured into a mixer in sequence. During the addition process, an initial stirring rate of 1440 r / min is used for stirring. The internal air pressure of the stirring tank is detected by an air pressure sensor, and the feed rate is adjusted when it is determined that the degree of gas precipitation exceeds the allowable range. After the addition is completed, the stirring time of the stirring component is set to one hour, and the fluctuation amplitude of the liquid mixed foaming raw material is detected during the stirring process, and the stirring rate is adjusted when the fluctuation amplitude exceeds the allowable range.

[0110] Example 3

[0111] The first experimental data of the present invention are:

[0112]

[0113]

[0114] The second experimental data of the present invention is:

[0115]

[0116] The final experimental data of the present invention are:

[0117]

[0118] Compared with common foaming materials, the hard foaming material prepared by the present invention has the characteristics of light weight, heat insulation, thermal insulation, waterproofness, wear resistance, strong vibration resistance and strong bonding force.

[0119] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0120] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a rigid foam material, characterized in that: include: Step S1, delivering a corresponding weight of foaming raw material into a stirring tank through a feeding device, and stirring the foaming raw material with a stirrer to output a liquid mixed foaming raw material; Pour polyether 480, catalyst A33, catalyst DMEA, silicone oil K888, triethanolamine, tap water, ethylene glycol, and foaming agent F-580 into the mixer in sequence. During the addition process, stir at an initial stirring rate of 1440 r / min. After the addition is completed, set the stirring time of the stirring component to one hour. Step S2, conveying the liquid mixed foaming raw material into a foaming mold, and using a heating device to heat the foaming mold so that the foaming mold outputs a finished foaming material; Step S3, the central control module controls the foam material density tester to test the density of the finished foam material in several test cycles, calculates the density variance of the finished foam material according to the density test result, and determines the stability of the foam material preparation process according to the density variance of the finished foam material; Step S4, when the central control module determines that the stability of the foaming material preparation process is lower than the allowable range, the central control module initially adjusts the running speed of the stirring assembly in the vertical direction, or adjusts the feeding rate of the foaming raw material according to the internal air pressure of the stirring tank; Step S5, when the central control module completes the initial adjustment of the vertical stirring component running speed, the central control module performs a secondary adjustment on the vertical stirring component running speed according to the average compression strength of the finished foaming material, or adjusts the stirring motor speed according to the fluctuation amplitude of the liquid mixed foaming raw material; The central control module determines the stability of the foam material preparation process according to the variance of the density of the finished foam material. When the variance of the density of the finished foam material satisfies the preset first variance condition and the preset second variance condition, the central control module determines that the stability of the foam material preparation process is lower than the allowable range, wherein: The central control module determines to increase the running speed of the stirring component in the vertical direction under a preset first variance condition; The central control module preliminarily determines that the degree of gas precipitation exceeds the allowable range under the preset second variance condition, and performs a secondary determination on the degree of gas precipitation according to the gas pressure inside the mixing tank; Wherein, the preset first variance condition is that the variance of the density of the finished foam material is greater than the preset first variance and less than or equal to the preset second variance; the preset second variance condition is that the variance of the density of the finished foam material is greater than the preset second variance; the preset first variance is less than the preset second variance; The central control module performs a secondary determination on the degree of gas precipitation according to the gas pressure inside the stirring tank under the preset second variance condition, wherein: The central control module determines for the second time that the gas precipitation degree exceeds the allowable range under the preset air pressure condition, and adjusts the feeding rate of the foaming raw material; Wherein, the preset air pressure condition is that the air pressure inside the stirring tank is greater than the preset air pressure; When the initial adjustment of the vertical stirring component running speed is completed, the central control module determines whether the effectiveness of stirring is within the allowable range according to the average compression strength of the finished foaming material, wherein: The central control module determines that the effectiveness of stirring is lower than the allowable range under the preset first compression strength condition and the preset second compression strength condition, wherein: The central control module determines to perform secondary adjustment on the running speed of the stirring assembly in the vertical direction under the preset first compression strength condition; The central control module preliminarily determines that the stability of the stirring tank is lower than the allowable range under the preset second compression strength condition, and performs a secondary determination on the stability of the stirring tank according to the fluctuation amplitude of the liquid mixed foaming raw material; Wherein, the preset first compression strength condition is that the average compression strength of the finished foam material is greater than the preset first compression strength and less than or equal to the preset second compression strength; the preset second compression strength condition is that the average compression strength of the finished foam material is greater than the preset second compression strength; the preset first compression strength is less than the preset second compression strength; The central control module performs a secondary determination on the stability of the stirring tank according to the fluctuation amplitude of the liquid mixed foaming raw material under the preset second compression strength condition, wherein: The central control module determines that the stability of the mixing tank is below the allowable range under the preset amplitude condition; Wherein, the preset amplitude condition is that the fluctuation amplitude of the liquid mixed foaming raw material is greater than the preset amplitude.

2. The method for preparing a rigid foam material according to claim 1, characterized in that: The central control module determines several adjustment methods for increasing the running speed of the stirring component in the vertical direction according to the difference between the variance of the density of the finished foaming material and the preset first variance under the preset first variance condition, wherein each adjustment method has a different adjustment magnitude for increasing the running speed of the stirring component in the vertical direction.

3. The method for preparing a rigid foam material according to claim 2, characterized in that: The central control module determines several adjustment methods for increasing the feed rate of the foaming raw material under the preset air pressure condition according to the difference between the air pressure inside the stirring tank and the preset air pressure, wherein each feed rate adjustment method has a different adjustment degree for increasing the feed rate of the foaming raw material.

4. The method for preparing a rigid foam material according to claim 3, characterized in that: The central control module determines several secondary adjustment methods for increasing the operating speed of the stirring component in the vertical direction according to the difference between the average compression strength of the finished foaming material and the preset first compression strength under the preset first compression strength condition, wherein each secondary adjustment method has a different adjustment degree for increasing the operating speed of the stirring component in the vertical direction.

5. The method for preparing a rigid foam material according to claim 4, characterized in that: The central control module determines several adjustment methods for reducing the speed of the stirring motor according to the difference between the fluctuation amplitude of the liquid mixed foaming raw material and the preset amplitude under the preset amplitude condition, wherein each speed adjustment method has a different adjustment degree for reducing the speed of the stirring motor.

6. A rigid foam material, characterized in that: The rigid foam material is prepared by the method for preparing the rigid foam material according to any one of claims 1 to 5.

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