Process and apparatus for reducing the viscosity of one-component polyurethane resins by compression liquefaction

Abstract

The present application relates to the technical field of polyurethane, and particularly relates to a compression liquefaction method and equipment for reducing the viscosity of single-component polyurethane resin, which comprises the following steps: mixing a first preset mass of single-component polyurethane resin and a second preset mass of diluent in a mixing device to obtain a mixed solution; stirring the mixed solution at a preset stirring rate, and increasing the temperature in the mixing device to a preset temperature; detecting the viscosity of the mixed solution, and determining the adjustment of the preset stirring rate, the preset temperature and the second preset mass according to the viscosity and a preset viscosity; when the viscosity reaches the preset viscosity, filling high-pressure gas and opening a high-pressure sprayer, detecting the atomization degree, and determining the adjustment of the viscosity detection mode according to the atomization degree and a preset atomization degree; detecting the curing time of the polyurethane resin, and correcting the adjustment coefficient of the second preset mass according to the curing time and a preset curing time, so that the viscosity of the single-component polyurethane can be adjusted in real time according to the actual situation, and the atomization degree can reach the standard.

Description

Technical Field

[0001] This invention relates to the field of polyurethane technology, and more particularly to a compression liquefaction method for reducing the viscosity of a single-component polyurethane resin. Background Technology

[0002] One-component polyurethane is a special type of polymer that contains only one main polymer component. This means that no additional crosslinking agents or additives are needed during preparation and application. One-component polyurethanes are typically isocyanate-based, forming a polyurethane structure through reaction with water or other active hydrogen compounds. They possess good abrasion resistance, chemical resistance, and excellent elasticity, thus finding wide application in coatings, sealants, adhesives, and elastomers.

[0003] Chinese Patent Application Publication No. CN111303376A discloses a pressure-filled, surface-sprayable one-component polyurethane foam, its preparation method, and its application. The one-component polyurethane foam comprises the following components: a low-viscosity polyurethane prepolymer, a foaming agent, and a pressurizing agent. The low-viscosity polyurethane prepolymer is formed by reacting a combined polyether with polymethylene polyphenyl isocyanate. The combined polyether includes a polyol, a flame retardant, a foam stabilizer, and a catalyst. The polyol is a low-functionality, low-hydroxyl-value polyol. The pressurizing agent is a gas with a pressure greater than or equal to 0.70 MPa at 21°C. This invention achieves low viscosity and high pressure in one-component polyurethane foam through a rational formulation. Combined with a spray gun (tube), it enables spraying, allowing for filling not only small-volume aerosol cans but also large-volume steel cans. This overcomes the shortcomings of existing one-component polyurethane foam sealants, which cannot be sprayed, and the inconvenience of spraying small areas with two-component polyurethane foam.

[0004] Therefore, the existing technology still has the following problems: the viscosity of single-component polyurethane cannot be adjusted according to the actual situation, resulting in substandard atomization. Summary of the Invention

[0005] Therefore, the present invention provides a compression liquefaction method for reducing the viscosity of a single-component polyurethane resin, in order to overcome the problem in the prior art that the viscosity of a single-component polyurethane cannot be adjusted according to the actual situation, resulting in substandard atomization.

[0006] To achieve the above objectives, in one aspect, the present invention provides a high-pressure liquefaction method for reducing the viscosity of a single-component polyurethane resin, comprising:

[0007] A first preset mass of single-component polyurethane resin and a second preset mass of diluent are mixed in a mixing device to obtain a mixed solution.

[0008] The mixture is stirred at a preset stirring rate, and the temperature inside the mixing device is raised to a preset temperature.

[0009] After stirring for a preset time period, the viscosity of the mixed solution is detected, and the stirring parameters are adjusted based on the viscosity and the preset viscosity. The stirring parameters include the preset stirring rate, the preset temperature, and the second preset mass.

[0010] When the viscosity reaches the preset viscosity, high-pressure gas is introduced into the mixing device and the high-pressure sprayer connected to the mixing device is turned on. The atomization degree is detected, and the viscosity detection is adjusted according to the atomization degree and the preset atomization degree.

[0011] The curing time of the polyurethane resin is detected, and the adjustment coefficient of the second preset quality is corrected according to the curing time and the preset curing time.

[0012] Furthermore, determining the stirring parameters based on viscosity and preset viscosity includes determining the preset stirring rate under the condition that the viscosity is greater than a first preset viscosity and less than or equal to a second preset viscosity.

[0013] Furthermore, determining the adjustment of stirring parameters based on viscosity and preset viscosity includes adjusting the preset temperature when the preset stirring rate is adjusted to the maximum stirring rate, so that the viscosity reaches the first preset viscosity.

[0014] Furthermore, determining the adjustment of stirring parameters based on viscosity and preset viscosity includes determining the adjustment of the second preset mass when the viscosity is greater than the second preset viscosity.

[0015] Furthermore, determining the stirring parameters based on the viscosity and the preset viscosity includes determining an adjustment coefficient for the second preset mass based on the difference between the viscosity and the first preset viscosity to adjust the second preset mass.

[0016] Furthermore, the step of adjusting the viscosity detection based on the atomization degree and the preset atomization degree includes determining that the viscosity detection is adjusted to multi-point detection when the atomization degree is less than the preset atomization degree.

[0017] Furthermore, the step of correcting the adjustment coefficient of the second preset quality based on the curing time and the preset curing time includes determining to correct the adjustment coefficient with a first correction coefficient when the curing time is greater than the first preset curing time.

[0018] Furthermore, the step of correcting the adjustment coefficient of the second preset quality based on the curing time and the preset curing time includes determining to correct the adjustment coefficient with a second correction coefficient under the condition that the curing time is greater than or equal to the first preset curing time and less than the second preset curing time.

[0019] Furthermore, the step of correcting the adjustment coefficient of the second preset quality based on the curing time and the preset curing time includes determining to correct the adjustment coefficient with a third correction coefficient when the curing time is greater than or equal to the second preset curing time.

[0020] On the other hand, the present invention also provides a compression liquefaction device for reducing the viscosity of a single-component polyurethane resin, comprising: a mixing device having a stirrer therein;

[0021] A storage device comprising a first storage tank for storing a single-component polyurethane resin, a second storage tank for storing a diluent, and a third storage tank for storing a high-pressure gas.

[0022] The detection device includes several viscosity detectors and a temperature sensor for detecting temperature;

[0023] A high-pressure sprayer, which is connected to the mixing device;

[0024] A heating device, disposed within the mixing device, is used to heat the single-component polyurethane resin;

[0025] A control device is connected to the stirrer, the heating device and the detection device respectively, for controlling the stirrer to stir the mixed solution at a preset stirring rate and to heat the mixed solution at a preset temperature.

[0026] Compared with the prior art, the beneficial effect of the present invention is that, by detecting the viscosity of the mixed solution, the present invention determines the adjustment of the preset stirring rate, preset temperature and second preset mass based on the viscosity and preset viscosity, and can adjust the viscosity of the single-component polyurethane according to the actual situation so that the atomization degree meets the standard.

[0027] Furthermore, determining the viscosity detection method based on the atomization degree and the preset atomization degree can improve the accuracy of the viscosity detection method.

[0028] Furthermore, adjusting the adjustment coefficient of the second preset mass based on the curing time and the preset curing time can further improve the accuracy of the diluent addition amount and prevent excessive diluent addition from affecting the curing time of the polyurethane resin.

[0029] Furthermore, under the condition that the viscosity is greater than a first preset viscosity and less than or equal to a second preset viscosity, the preset stirring rate is adjusted. By increasing the stirring rate, the shear force on the mixed solution can be increased, thereby reducing the viscosity of the single-component polyurethane.

[0030] Furthermore, when the preset stirring rate is adjusted to the maximum stirring rate, the preset temperature is adjusted so that the viscosity reaches the first preset viscosity. By increasing the temperature, the thermal motion between molecules is increased, thereby further reducing the viscosity of the polyurethane resin. This avoids the situation where the viscosity of the mixed solution cannot reach the first preset viscosity simply by adjusting the stirring rate, thus improving the efficiency of adjusting the viscosity of the mixed solution. Attached Figure Description

[0031] Figure 1 This is a flowchart of a compression liquefaction method for reducing the viscosity of a single-component polyurethane resin according to an embodiment of the present invention.

[0032] Figure 2 This invention relates to a compression liquefaction device for reducing the viscosity of a single-component polyurethane resin.

[0033] In the picture:

[0034] Mixing device 1; first storage tank 2; second storage tank 3; viscosity detector 4; temperature sensor 5; heating device 6; high-pressure sprayer 7; stirrer 8. Detailed Implementation

[0035] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0036] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0037] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0038] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Please refer to Figure 2 This is a compression liquefaction device for reducing the viscosity of single-component polyurethane resin according to an embodiment of the present invention.

[0040] In this embodiment of the invention, a compression liquefaction device for reducing the viscosity of a single-component polyurethane resin includes:

[0041] Mixing device 1, which contains a stirrer 8;

[0042] The storage device includes a first storage tank 2 for storing a single-component polyurethane resin, a second storage tank 3 for storing a diluent, and a third storage tank (not shown in the figure) for storing high-pressure gas.

[0043] The detection device includes several viscosity detectors 4 and a temperature sensor 5 for detecting temperature;

[0044] High-pressure sprayer 7, which is connected to the mixing device 1;

[0045] Heating device 6, which is disposed in the mixing device 1, is used to heat the single-component polyurethane resin;

[0046] A control device is connected to the stirrer 8, the heating device 6 and the detection device respectively, for controlling the stirrer 8 to stir the mixed solution at a preset stirring rate and to heat the mixed solution at a preset temperature.

[0047] Please see Figure 1 As shown, it is a flowchart of a high-pressure liquefaction method for reducing the viscosity of a single-component polyurethane resin according to the present invention.

[0048] In this embodiment of the invention, a high-pressure liquefaction method for reducing the viscosity of a single-component polyurethane resin includes:

[0049] S1: Mix the first preset mass M01 of single-component polyurethane resin and the second preset mass M02 of diluent in the mixing device 1 to obtain a mixed solution;

[0050] Specifically, the diluent is any one of acetone, toluene, or xylene.

[0051] Specifically, M01 = 70g and M02 = 30g are set. Those skilled in the art can set the values ​​of the first preset mass M01 and the second preset mass M02 according to actual needs.

[0052] S2: The control device stirs the mixed solution at a preset stirring rate R0 and raises the temperature inside the mixing device 1 to a preset temperature T0;

[0053] Specifically, the control device is preset with R0 = 1500 r / min and T0 = 30℃. Those skilled in the art can set the values ​​of the preset stirring rate R0 and the preset temperature T0 according to actual needs.

[0054] S3: After a preset stirring time period, the viscosity detector 4 detects the viscosity N of the mixed solution, and the control device determines the adjustment of the preset stirring rate R0, the preset temperature T0, and the second preset mass M02 based on the viscosity N and the preset viscosity N0.

[0055] S4: When the viscosity reaches the preset viscosity, high-pressure gas is introduced into the mixing device 1 and the high-pressure sprayer 7 connected to the mixing device 1 is turned on, and the atomization degree D is detected. The detection method for adjusting the viscosity is determined according to the atomization degree D and the preset atomization degree D0.

[0056] Specifically, a three-dimensional image of the polyurethane spray ejected from the high-pressure sprayer 7 is acquired by an image acquisition device, and the number n of spray particles with a preset volume S0 on the three-dimensional image is obtained.

[0057] Specifically, the atomization degree D is calculated and set according to the following formula:

[0058]

[0059] The unit of L is μm.

[0060] Specifically, let S0 = 1cm 3 D0 = 1000. Those skilled in the art can set the values ​​of the preset area S0 and the preset atomization degree D0 according to actual needs.

[0061] S5: The curing time of the polyurethane resin is detected, and the control device corrects the adjustment coefficient of the second preset quality according to the curing time t and the preset curing time t0.

[0062] In this embodiment of the invention, the polyurethane resin is sprayed onto a sample with a thickness of 1 mm, and the time it takes for the polyurethane resin to reach a preset hardness standard is recorded as the curing time t.

[0063] In this embodiment of the invention, the preset curing time is 10 hours. Those skilled in the art can set the preset curing time t0 and the preset hardness standard according to actual needs.

[0064] Specifically, the present invention detects the viscosity of the mixed solution and determines the adjustment of the preset stirring rate, preset temperature and second preset mass based on the viscosity and preset viscosity. The viscosity of the single-component polyurethane can be adjusted according to the actual situation to achieve the atomization standard.

[0065] Specifically, the control device determines to adjust the preset stirring rate R0 when the viscosity N is greater than the first preset viscosity N01 and less than or equal to the second preset viscosity N02.

[0066] Specifically, by increasing the stirring rate, the shear force on the mixed solution can be increased, thereby reducing the viscosity of the single-component polyurethane.

[0067] Specifically, when the preset maximum stirring rate Rmax is in the control device, when the preset stirring rate R0 is adjusted to the maximum stirring rate Rmax, the preset temperature T0 is adjusted so that the viscosity N reaches the first preset viscosity N01.

[0068] Specifically, by increasing the temperature to increase the thermal motion between molecules, the viscosity of the polyurethane resin can be further reduced, avoiding the inability to reach the first preset viscosity of the mixed solution simply by adjusting the stirring rate, thus improving the efficiency of adjusting the viscosity of the mixed solution.

[0069] In this embodiment of the invention, the control device is preset with N01 = 1200 mPa·s and N02 = 2000 mPa·s. Those skilled in the art can set the values ​​of the first preset viscosity N01 and the second preset viscosity N02 according to actual needs.

[0070] Specifically, when the viscosity N is greater than the second preset viscosity N02, the control device determines to adjust the second preset mass M02.

[0071] The control device determines the adjustment coefficient of the second preset mass M02 based on the difference between the viscosity N and the first preset viscosity N01, and adjusts the second preset mass M02 accordingly.

[0072] The difference between the viscosity N and the first preset viscosity N01 is denoted as ΔN, where ΔN = N - N01. The adjusted second preset mass is denoted as M02', where M02' = XiM02, and Xi represents the i-th adjustment coefficient, i = 1, 2, 3.

[0073] Specifically, the control device determines the adjustment coefficient Xi of the second preset mass M02 based on the comparison result of ΔN and the preset viscosity difference ΔN0, wherein the preset viscosity difference ΔN0 includes the first preset viscosity difference ΔN01 and the second preset viscosity difference ΔN02.

[0074] When ΔN < ΔN01, the control device determines to adjust the second preset mass by the first adjustment coefficient X1;

[0075] When ΔN01≤ΔN<ΔN02, the control device determines to adjust the second preset mass with the second adjustment coefficient X2;

[0076] When ΔN≥ΔN02, the control device determines to adjust the second preset mass with the third adjustment coefficient X3;

[0077] Where 1.0 < X1 < X2 < X3 < 1.4.

[0078] In this embodiment of the invention, the mass of the diluent to be added is denoted as ΔM02=M02'-M02.

[0079] Specifically, the detection method for adjusting the viscosity based on the atomization degree and the preset atomization degree includes determining whether to adjust the viscosity when the atomization degree D is less than the preset atomization degree D0.

[0080] Specifically, the viscosity is detected based on the comparison result between the atomization degree D and the preset atomization degree D0;

[0081] When D < D0, there is no need to adjust the viscosity detection method;

[0082] When D≥D0, the single-point viscosity detection mode is adjusted to a multi-point detection mode.

[0083] Specifically, determining the viscosity detection method based on the atomization degree and the preset atomization degree can improve the accuracy of the viscosity detection method.

[0084] Specifically, the control device corrects the adjustment coefficient of the second preset mass M02 based on the curing time t and the preset curing time t0, including determining to correct the adjustment coefficient with a first correction coefficient Y1 when the curing time t0 is greater than the first preset curing time t01.

[0085] Specifically, under the condition that the curing time t0 is greater than or equal to the first preset curing time t01 and less than the second preset curing time t02, the control device determines to correct the adjustment coefficient with the second correction coefficient Y2.

[0086] Specifically, under the condition that the curing time t0 is greater than or equal to the second preset curing time t02, the control device determines to correct the adjustment coefficient with a third correction coefficient Y3.

[0087] Specifically, the corrected adjustment coefficient is denoted as Xi', and Xi' = YmXi is set, where Ym represents the m-th correction coefficient, m = 1, 2, 3, and 0.6 < Y3 < Y2 < Y1 < 1.0.

[0088] Specifically, adjusting the adjustment coefficient of the second preset mass according to the curing time and the preset curing time can further improve the accuracy of the diluent addition amount and prevent excessive diluent addition from affecting the curing time of the polyurethane resin.

[0089] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles 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 all fall within the scope of protection of the present invention.

Claims

1. A high-pressure liquefaction method for reducing the viscosity of a single-component polyurethane resin, characterized in that, include: A first preset mass of single-component polyurethane resin and a second preset mass of diluent are mixed in a mixing device to obtain a mixed solution. The mixture is stirred at a preset stirring rate, and the temperature inside the mixing device is raised to a preset temperature. After stirring for a preset time period, the viscosity of the mixed solution is detected, and the stirring parameters are adjusted based on the viscosity and the preset viscosity. The stirring parameters include the preset stirring rate, the preset temperature, and the second preset mass. When the viscosity reaches the preset viscosity, high-pressure gas is introduced into the mixing device and the high-pressure sprayer connected to the mixing device is turned on. The atomization degree is detected, and the viscosity detection is adjusted according to the atomization degree and the preset atomization degree. The curing time of the polyurethane resin is detected, and the adjustment coefficient of the second preset quality is corrected according to the curing time and the preset curing time. The step of adjusting the viscosity detection based on the atomization degree and the preset atomization degree includes determining that the viscosity detection is adjusted to multi-point detection when the atomization degree is less than the preset atomization degree. The step of correcting the adjustment coefficient of the second preset quality based on the curing time and the preset curing time includes determining to correct the adjustment coefficient with a first correction coefficient when the curing time is greater than the first preset curing time. The step of correcting the adjustment coefficient of the second preset quality based on the curing time and the preset curing time includes determining to correct the adjustment coefficient with a second correction coefficient under the condition that the curing time is greater than or equal to the first preset curing time and less than the second preset curing time; The step of correcting the adjustment coefficient of the second preset quality based on the curing time and the preset curing time includes determining to correct the adjustment coefficient with a third correction coefficient when the curing time is greater than or equal to the second preset curing time.

2. The high-pressure liquefaction method for reducing the viscosity of a single-component polyurethane resin according to claim 1, characterized in that, The step of determining the stirring parameters based on viscosity and preset viscosity includes determining the preset stirring rate under the condition that the viscosity is greater than a first preset viscosity and less than or equal to a second preset viscosity.

3. The high-pressure liquefaction method for reducing the viscosity of a single-component polyurethane resin according to claim 2, characterized in that, The step of determining and adjusting the stirring parameters based on viscosity and preset viscosity includes adjusting the preset temperature when the preset stirring rate is adjusted to the maximum stirring rate, so that the viscosity reaches the first preset viscosity.

4. The high-pressure liquefaction method for reducing the viscosity of a single-component polyurethane resin according to claim 3, characterized in that, The step of determining the stirring parameters based on viscosity and preset viscosity includes determining the adjustment of the second preset mass when the viscosity is greater than the second preset viscosity.

5. The high-pressure liquefaction method for reducing the viscosity of a single-component polyurethane resin according to claim 4, characterized in that, The step of determining the stirring parameters based on viscosity and preset viscosity includes determining the adjustment coefficient of the second preset mass based on the difference between the viscosity and the first preset viscosity in order to adjust the second preset mass.

6. A compression liquefaction apparatus for use in the high-pressure liquefaction method for reducing the viscosity of a single-component polyurethane resin as described in any one of claims 1-5, characterized in that, include: A mixing device, which contains a stirrer; A storage device comprising a first storage tank for storing a single-component polyurethane resin, a second storage tank for storing a diluent, and a third storage tank for storing a high-pressure gas. The detection device includes several viscosity detectors and a temperature sensor for detecting temperature; A high-pressure sprayer, which is connected to the mixing device; A heating device, disposed within the mixing device, is used to heat the single-component polyurethane resin; A control device is connected to the stirrer, the heating device and the detection device respectively, for controlling the stirrer to stir the mixed solution at a preset stirring rate and to heat the mixed solution at a preset temperature.

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