Preparation process of negative oxygen ion thermosetting powder coating for purifying air

Abstract

The invention relates to the technical field of powder coating preparation, in particular to an air purification negative oxygen ion thermosetting powder coating preparation technology which comprises the steps that thermosetting resin, a curing agent, filler, pigment and a plastic additive are stirred and mixed in a mixing tank according to a first preset proportion; extruding and tabletting the mixed thermosetting resin mixture; judging whether the mixing of the thermosetting resin mixture meets a preset standard or not according to the variable coefficient value of the section of the mixture sheet; crushing and grinding the mixed material sheets meeting the preset standard to obtain thermosetting resin mixed material powder; judging whether grinding meets a preset standard or not according to the granularity uniformity evaluation value; mixing and grinding the mixed material powder meeting the preset standard and the negative ion synthetic powder according to a second preset proportion; and sieving the ground negative ion mixed powder to obtain the negative oxygen ion thermosetting powder coating. By strictly controlling the process parameters, the product quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of powder coating preparation, and in particular to a preparation process of air-purifying negative oxygen ion thermosetting powder coating. Background Art

[0002] Negative oxygen ion paint is an environmentally friendly and healthy decorative material that can continuously release high concentrations of negative oxygen ions. Negative oxygen ions can absorb and decompose harmful substances in the air, thereby improving indoor air quality. It can also promote the combination of oxygen molecules and water molecules in the air to form negative oxygen ion groups that are beneficial to the human body and are beneficial to human health.

[0003] China's patent application publication number: CN109749556A, discloses a negative oxygen ion coating, including the following components: Youchuang-E, acrylic acid water-based emulsion, titanium dioxide, ultrafine light calcium, ultrafine talc, ultrafine tourmaline powder, organic bentonite powder, deionized water, ethylene glycol, propylene glycol, activated carbon powder, ultrafine diatomaceous earth, hydroxyethyl cellulose, essence, pH adjuster to adjust the pH value to 8-9; auxiliary agent I: film-forming aid, bactericide, defoamer, viscosity reducer and dispersant. The present invention also discloses a method for preparing a negative oxygen ion coating, wherein the components are pre-mixed and ground and dispersed in a reasonable order to prepare a negative oxygen ion coating that releases negative oxygen ions more efficiently, has strong practicality, and has broad application prospects. It can be seen that the lack of monitoring of the preparation process in the above technical solution leads to low quality and high cost of the finished product of the negative oxygen ion thermosetting powder coating. Summary of the invention

[0004] To this end, the present invention provides a process for preparing air-purifying negative oxygen ion thermosetting powder coating, which is used to overcome the problems in the prior art of low quality and high cost of finished coating products due to lack of monitoring of the preparation process.

[0005] To achieve the above object, the present invention provides a preparation process of air-purifying negative oxygen ion thermosetting powder coating, comprising:

[0006] Step S1, stirring and mixing a thermosetting resin, a curing agent, a filler, a pigment and a plastic additive in a mixing tank according to a first preset ratio;

[0007] Step S2, extruding the mixed thermosetting resin mixture through a screw extruder and pressing the molten mixture into mixed tablets through a cooling tablet press;

[0008] Step S3, judging whether the mixing of the thermosetting resin mixture meets the preset standard according to the cross-sectional variation coefficient value of the mixed material sheet, if not meeting the preset standard, judging whether the mixing of the thermosetting resin mixture meets the preset standard for the second time according to the extrusion flow rate, or increasing the heating temperature of the second heating zone of the screw extruder;

[0009] Step S4, crushing the mixed material flakes that meet the preset standards and grinding them with a ball mill to obtain thermosetting resin mixed material powder;

[0010] Step S5, judging whether the grinding meets the preset standard according to the particle size uniformity evaluation value of the thermosetting resin mixture powder, if it does not meet the preset standard, increasing the speed of the ball mill, or reducing the ratio of the material to the ball milling balls in the ball mill;

[0011] Step S6, mixing and grinding the mixed material powder that meets the preset standard and the negative ion synthetic powder according to a second preset ratio;

[0012] Step S7, sieving the ground negative ion mixed powder to obtain negative oxygen ion thermosetting powder coating.

[0013] Further, whether the mixing of the thermosetting resin mixture meets the preset standard is determined according to the cross-sectional variation coefficient value of the mixed material sheet, wherein:

[0014] If the cross-sectional variation coefficient value is less than the first preset cross-sectional variation coefficient value, it is determined that the mixing of the thermosetting resin mixture meets the preset standard, and the next step of processing is performed;

[0015] If the cross-sectional variation coefficient value is greater than or equal to the first preset cross-sectional variation coefficient value and less than the second preset cross-sectional variation coefficient value, it is determined that the mixing of the thermosetting resin mixture does not meet the preset standard, and a secondary determination is made based on the extrusion flow rate whether the mixing of the thermosetting resin mixture meets the preset standard;

[0016] If the cross-sectional variation coefficient value is greater than or equal to the second preset cross-sectional variation coefficient value, it is determined that the mixing of the thermosetting resin mixture does not meet the preset standard, and the heating temperature of the second heating zone of the screw extruder is increased according to the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value.

[0017] Further, a second determination is made based on the extrusion flow rate whether the mixing of the thermosetting resin mixture meets a preset standard, wherein:

[0018] If the extrusion flow rate is less than a preset extrusion flow rate, it is determined that the mixing of the thermosetting resin mixture does not meet a preset standard, and the rotation speed of the screw is increased according to the difference between the preset extrusion flow rate and the extrusion flow rate;

[0019] If the extrusion flow rate is greater than or equal to the preset extrusion flow rate, it is determined that the mixing of the thermosetting resin mixture meets the preset standard, and the next step of processing is performed.

[0020] Further, the heating temperature of the second heating zone of the screw extruder is increased according to the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value, wherein,

[0021] If the cross-sectional variation coefficient value difference is less than the first preset variation coefficient value difference, the heating temperature of the second heating zone of the screw extruder is adjusted to a corresponding value using the first temperature adjustment coefficient;

[0022] If the cross-sectional variation coefficient value difference is greater than or equal to the first preset variation coefficient value difference and less than the second preset variation coefficient value difference, the heating temperature of the second heating zone of the screw extruder is adjusted to a corresponding value using the second temperature adjustment coefficient;

[0023] If the cross-sectional variation coefficient value difference is greater than or equal to the second preset variation coefficient value difference, the heating temperature of the second heating zone of the screw extruder is adjusted to a corresponding value using a third temperature adjustment coefficient;

[0024] The cross-sectional variation coefficient value difference is the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value.

[0025] Furthermore, the adjustment range of the screw rotation speed is positively correlated with the difference in extrusion flow rate, where

[0026] The extrusion flow rate difference is a difference between the preset extrusion flow rate and the extrusion flow rate.

[0027] Further, the eligibility of the temperature regulation of the second heating zone of the screw extruder is determined according to the cross-sectional variation coefficient value, wherein:

[0028] If the cross-sectional variation coefficient value is less than the preset cross-sectional variation coefficient value, it is determined that the temperature regulation of the second heating zone of the screw extruder is qualified;

[0029] If the cross-sectional variation coefficient value is greater than or equal to the preset cross-sectional variation coefficient value, the temperature regulation of the second heating zone of the screw extruder is determined to be unqualified, and the raw material particle size is reduced according to the difference between the cross-sectional variation coefficient value and the preset cross-sectional variation coefficient value.

[0030] Further, whether the grinding meets the preset standard is determined according to the particle size uniformity evaluation value, wherein:

[0031] If the particle size uniformity evaluation value is less than the first preset particle size uniformity evaluation value, it is determined that the grinding meets the preset standard and the next step of processing is performed;

[0032] If the particle size uniformity evaluation value is greater than or equal to the first preset particle size uniformity evaluation value and less than the second preset particle size uniformity evaluation value, it is determined that the grinding does not meet the preset standard, and the rotation speed of the ball mill is increased according to the difference between the particle size uniformity evaluation value and the first preset particle size uniformity evaluation value;

[0033] If the particle size uniformity evaluation value is greater than or equal to the second preset particle size uniformity evaluation value, it is determined that the grinding does not meet the preset standard, and the ratio of material to ball milling balls in the ball mill is reduced according to the difference between the particle size uniformity evaluation value and the second preset particle size uniformity evaluation value.

[0034] Furthermore, the particle size uniformity evaluation value is determined by the average particle size and particle size variance of the material powder after ball milling.

[0035] Furthermore, several ratio adjustment methods are provided for reducing the ratio of material to ball milling balls in the ball mill, and each ratio adjustment method has a different adjustment range for the ratio of material to ball milling balls.

[0036] Furthermore, the agglomeration index of the material after the speed of the ball mill is increased is used to further determine whether the grinding meets the standard, wherein:

[0037] If the agglomeration index is less than the preset agglomeration index, it is determined that the grinding meets the standard and the next step of processing is performed;

[0038] If the agglomeration index is greater than or equal to the preset agglomeration index, it is determined that the grinding does not meet the standard, and the duration of ball milling is corrected according to the difference between the agglomeration index and the preset agglomeration index.

[0039] Compared with the prior art, the beneficial effect of the present invention is that the present invention introduces a cross-sectional variation coefficient value, and determines whether the mixing of the thermosetting resin mixture meets the preset standard according to the cross-sectional variation coefficient value of the mixed material sheet, wherein if it meets the preset standard, the next step of processing is performed; if it does not meet the preset standard, the mixing of the thermosetting resin mixture meets the preset standard according to the extrusion flow rate, or the heating temperature of the second heating zone of the screw extruder is increased according to the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value. The present invention provides specific adjustment measures according to the cross-sectional variation coefficient value in different ranges, so that the parameter adjustment in the production process is more flexible and accurate, and the production efficiency and product quality can be optimized.

[0040] Further, it is determined whether the mixing of the thermosetting resin mixture meets the preset standard based on the extrusion flow rate, wherein if the extrusion flow rate is less than the preset extrusion flow rate, it is determined that the mixing of the thermosetting resin mixture does not meet the preset standard, and the rotation speed of the screw is increased according to the difference between the preset extrusion flow rate and the extrusion flow rate; if the extrusion flow rate is greater than or equal to the preset extrusion flow rate, it is determined that the mixing of the thermosetting resin mixture meets the preset standard, and the next step of processing is performed. The secondary determination can more accurately determine the problems existing in the production process and adjust them in time.

[0041] Furthermore, the heating temperature of the second heating zone of the screw extruder is increased according to the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value. For different ranges of the cross-sectional variation coefficient value difference, the present invention uses different temperature adjustment coefficients to adjust the heating temperature of the second heating zone of the screw extruder. This targeted temperature adjustment method helps to better control the heating process of the mixture, thereby improving the uniformity and performance of the coating.

[0042] Furthermore, the eligibility of the temperature regulation of the second heating zone of the screw extruder is determined according to the cross-sectional variation coefficient value, wherein if the cross-sectional variation coefficient value is less than the preset cross-sectional variation coefficient value, the temperature regulation of the second heating zone of the screw extruder is determined to be qualified; if the cross-sectional variation coefficient value is greater than or equal to the preset cross-sectional variation coefficient value, the temperature regulation of the second heating zone of the screw extruder is determined to be unqualified, and the raw material particle size is reduced according to the difference between the cross-sectional variation coefficient value and the preset cross-sectional variation coefficient value. By determining the eligibility of the adjusted parameters through the cross-sectional variation coefficient value, it is possible to determine whether the adjustment is correct. If it is not correct, other adjustment methods are provided to achieve intelligent control of the parameters.

[0043] Further, it is determined whether the grinding meets the preset standard according to the particle size uniformity evaluation value, wherein, if the particle size uniformity evaluation value is less than the first preset particle size uniformity evaluation value, it is determined that the grinding meets the preset standard, and the next step of processing is performed; if the particle size uniformity evaluation value is greater than or equal to the first preset particle size uniformity evaluation value and less than the second preset particle size uniformity evaluation value, it is determined that the grinding does not meet the preset standard, and the speed of the ball mill is increased according to the difference between the particle size uniformity evaluation value and the first preset particle size uniformity evaluation value; if the particle size uniformity evaluation value is greater than or equal to the second preset particle size uniformity evaluation value, it is determined that the grinding does not meet the preset standard, and the ratio of the material to the ball mill in the ball mill is reduced according to the difference between the particle size uniformity evaluation value and the second preset particle size uniformity evaluation value. By introducing the particle size uniformity evaluation value, the particle size uniformity of the ground material powder can be accurately evaluated. At the same time, according to the difference between the particle size uniformity evaluation value and the preset value, measures such as increasing the ball mill speed or reducing the ratio of the material to the ball mill are taken to further optimize the particle size uniformity and ensure the quality of the coating.

[0044] Furthermore, the particle size uniformity evaluation value is determined based on the average particle size and particle size variance of the material powder after ball milling, thereby improving the accuracy of the evaluation value.

[0045] Furthermore, the agglomeration index of the material after the speed of the ball mill is increased is used to further determine whether the grinding meets the standard, wherein if the agglomeration index is less than the preset agglomeration index, the grinding is determined to meet the standard and the next step of processing is performed; if the agglomeration index is greater than or equal to the preset agglomeration index, the grinding is determined to not meet the standard, and the ball milling time is corrected according to the difference between the agglomeration index and the preset agglomeration index. The agglomeration index is used to further determine whether the grinding meets the standard. This dual determination method helps to ensure the efficiency and quality stability of the grinding process, thereby improving the overall performance of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a flow chart of a process for preparing a thermosetting powder coating for purifying air with negative oxygen ions according to an embodiment of the present invention;

[0047] Figure 2 It is a structural schematic diagram of a screw extruder according to an embodiment of the present invention;

[0048] Figure 3 This is a flow chart of determining whether the mixing of the thermosetting resin mixture meets the preset standard according to the cross-sectional variation coefficient value according to an embodiment of the present invention;

[0049] Figure 4 This is a flow chart of an embodiment of the present invention for determining whether grinding meets a preset standard according to a particle size uniformity evaluation value;

[0050] In the figure: 1. Feeding zone; 2. First heating zone; 3. Compression zone; 4. Second heating zone; 5. Homogenization zone. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0054] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] See also Figures 1 to 4 As shown, they are respectively a flow chart of a process for preparing a thermosetting powder coating for purifying air with negative oxygen ions according to an embodiment of the present invention; a schematic structural diagram of a screw extruder according to an embodiment of the present invention; a flow chart of determining whether the mixing of the thermosetting resin mixture meets a preset standard according to a cross-sectional variation coefficient value according to an embodiment of the present invention; a flow chart of determining whether the grinding meets a preset standard according to a particle size uniformity evaluation value according to an embodiment of the present invention.

[0056] The preparation process of the air-purifying negative oxygen ion thermosetting powder coating according to the embodiment of the present invention comprises:

[0057] Step S1, stirring and mixing a thermosetting resin, a curing agent, a filler, a pigment and a plastic additive in a mixing tank according to a first preset ratio;

[0058] Step S2, extruding the mixed thermosetting resin mixture through a screw extruder and pressing the molten mixture into mixed tablets through a cooling tablet press;

[0059] Step S3, judging whether the mixing of the thermosetting resin mixture meets the preset standard according to the cross-sectional variation coefficient value of the mixed material sheet, if not meeting the preset standard, judging whether the mixing of the thermosetting resin mixture meets the preset standard for the second time according to the extrusion flow rate, or increasing the heating temperature of the second heating zone of the screw extruder;

[0060] Step S4, crushing the mixed material flakes that meet the preset standards and grinding them with a ball mill to obtain thermosetting resin mixed material powder;

[0061] Step S5, judging whether the grinding meets the preset standard according to the particle size uniformity evaluation value of the thermosetting resin mixture powder, if it does not meet the preset standard, increasing the speed of the ball mill, or reducing the ratio of the material to the ball milling balls in the ball mill;

[0062] Step S6, mixing and grinding the mixed material powder that meets the preset standard and the negative ion synthetic powder according to a second preset ratio;

[0063] Step S7, sieving the ground negative ion mixed powder to obtain negative oxygen ion thermosetting powder coating.

[0064] Specifically, the first preset ratio is 60-70 parts of thermosetting resin, 5-10 parts of curing agent, 20-25 parts of filler, 5-10 parts of pigment and 2-3 parts of plastic additive.

[0065] Specifically, the thermosetting resin is such as epoxy resin, the curing agent is such as dicyandiamide, the filler is such as barium sulfate, the pigment is such as titanium dioxide, and the plastic additive is such as a leveling agent. There is no specific limitation and it can be determined according to actual production conditions.

[0066] Specifically, the thermosetting resin mixture is fed from the feed zone 1 of the screw extruder, is initially heated in the first heating zone 2, is exhausted by the compression zone 3, is further heated and melted in the second heating zone 4, and finally is mixed evenly in the homogenization zone 5.

[0067] Specifically, the second preset ratio is 80-85 parts of the mixed material powder and 15-20 parts of the negative ion synthetic powder.

[0068] Specifically, whether the mixing of the thermosetting resin mixture meets the preset standard is determined according to the cross-sectional variation coefficient value of the mixed material sheet, wherein:

[0069] If the cross-sectional variation coefficient value is less than the first preset cross-sectional variation coefficient value of 0.3%, it is determined that the mixing of the thermosetting resin mixture meets the preset standard, and the next step of processing is performed;

[0070] If the cross-sectional variation coefficient value is greater than or equal to the first preset cross-sectional variation coefficient value and less than 0.5% of the second preset cross-sectional variation coefficient value, it is determined that the mixing of the thermosetting resin mixture does not meet the preset standard, and a secondary determination is made based on the extrusion flow rate whether the mixing of the thermosetting resin mixture meets the preset standard;

[0071] If the cross-sectional variation coefficient value is greater than or equal to the second preset cross-sectional variation coefficient value, it is determined that the mixing of the thermosetting resin mixture does not meet the preset standard, and the heating temperature of the second heating zone of the screw extruder is increased according to the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value.

[0072] Specifically, the cross-sectional variation coefficient value is determined according to GB / T 14687-2011 "Inspection Procedure for Rubber and Plastic Mixing Machines".

[0073] Specifically, the mixing of the thermosetting resin mixture is secondarily determined according to the extrusion flow rate to determine whether it meets the preset standard, wherein:

[0074] If the extrusion flow rate is less than a preset extrusion flow rate of 0.5 m / s, it is determined that the mixing of the thermosetting resin mixture does not meet the preset standard, and the rotation speed of the screw is increased according to the difference between the preset extrusion flow rate and the extrusion flow rate;

[0075] If the extrusion flow rate is greater than or equal to the preset extrusion flow rate, it is determined that the mixing of the thermosetting resin mixture meets the preset standard, and the next step of processing is performed.

[0076] Specifically, the heating temperature of the second heating zone of the screw extruder is increased according to the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value, wherein,

[0077] If the cross-sectional variation coefficient difference is less than the first preset variation coefficient difference of 0.06%, the heating temperature of the second heating zone of the screw extruder is adjusted to the corresponding value using the first temperature adjustment coefficient of 1.01;

[0078] If the cross-sectional variation coefficient difference is greater than or equal to the first preset variation coefficient difference and less than the second preset variation coefficient difference of 0.13%, the heating temperature of the second heating zone of the screw extruder is adjusted to the corresponding value using the second temperature adjustment coefficient of 1.05;

[0079] If the cross-sectional variation coefficient value difference is greater than or equal to the second preset variation coefficient value difference, the heating temperature of the second heating zone of the screw extruder is adjusted to a corresponding value using the third temperature adjustment coefficient 1.10;

[0080] The cross-sectional variation coefficient value difference is the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value.

[0081] Specifically, the adjustment range of the screw rotation speed is positively correlated with the difference in extrusion flow rate, where

[0082] If the extrusion flow rate difference is less than the first preset extrusion flow rate difference of 0.03 m / s, the first speed adjustment coefficient of 1.02 is used to increase the screw rotation speed to a corresponding value;

[0083] If the extrusion flow rate difference is greater than or equal to the first preset extrusion flow rate difference and less than the second preset extrusion flow rate difference of 0.05 m / s, the screw rotation speed is increased to a corresponding value using a second speed adjustment coefficient of 1.06;

[0084] If the extrusion flow rate difference is greater than or equal to the second preset extrusion flow rate difference, increasing the screw rotation speed to a corresponding value using a third speed adjustment coefficient of 1.09;

[0085] The extrusion flow rate difference is a difference between the preset extrusion flow rate and the extrusion flow rate.

[0086] Specifically, the eligibility of the temperature regulation of the second heating zone of the screw extruder is determined according to the cross-sectional variation coefficient value, wherein:

[0087] If the cross-sectional variation coefficient value is less than the preset cross-sectional variation coefficient value of 0.28%, it is determined that the temperature regulation of the second heating zone of the screw extruder is qualified;

[0088] If the cross-sectional variation coefficient value is greater than or equal to the preset cross-sectional variation coefficient value, the temperature regulation of the second heating zone of the screw extruder is determined to be unqualified, and the raw material particle size is reduced according to the difference between the cross-sectional variation coefficient value and the preset cross-sectional variation coefficient value.

[0089] Specifically, whether the grinding meets the preset standard is determined according to the particle size uniformity evaluation value, wherein:

[0090] If the particle size uniformity evaluation value is less than the first preset particle size uniformity evaluation value of 0.89, it is determined that the grinding meets the preset standard and the next step of processing is performed;

[0091] If the particle size uniformity evaluation value is greater than or equal to the first preset particle size uniformity evaluation value and less than the second preset particle size uniformity evaluation value of 0.95, it is determined that the grinding does not meet the preset standard, and the rotation speed of the ball mill is increased according to the difference between the particle size uniformity evaluation value and the first preset particle size uniformity evaluation value;

[0092] If the particle size uniformity evaluation value is greater than or equal to the second preset particle size uniformity evaluation value, it is determined that the grinding does not meet the preset standard, and the ratio of material to ball milling balls in the ball mill is reduced according to the difference between the particle size uniformity evaluation value and the second preset particle size uniformity evaluation value.

[0093] Specifically, the process of determining the particle size uniformity evaluation value by the average particle size and particle size variance of the material powder after ball milling includes:

[0094] The first evaluation coefficient is assigned to the square root of the ratio of the average particle size of the material powder after ball milling to the average particle size threshold to obtain the average particle size evaluation value, wherein the first evaluation coefficient is 0.55 and the average particle size threshold is 10 μm;

[0095] The second evaluation coefficient is assigned to the square root of the ratio of the particle size variance of the material powder after ball milling to the particle size variance threshold to obtain the particle size variance evaluation value, where the second evaluation coefficient is 0.42 and the particle size variance threshold is 0.05 μm. 2 ;

[0096] The sum of the average particle size evaluation value and the particle size variance evaluation value is recorded as the particle size uniformity evaluation value.

[0097] Specifically, there are several ratio adjustment methods for reducing the ratio of material to ball milling balls in the ball mill, and each ratio adjustment method has a different adjustment range for the ratio of material to ball milling balls, among which:

[0098] If the ratio of the material to the ball milling balls is less than the first preset ratio threshold value of 0.8, the ratio is adjusted to a corresponding value using the first ratio adjustment coefficient of 0.98;

[0099] If the ratio of the material to the ball milling balls is greater than or equal to the first preset ratio and less than the second preset ratio threshold value of 0.95, the ratio is adjusted to a corresponding value using the second ratio adjustment coefficient;

[0100] If the ratio of the material to the ball milling balls is greater than or equal to the second preset ratio, the ratio is adjusted to a corresponding value using a third ratio adjustment coefficient of 0.01.

[0101] Specifically, the preset ratio value is not limited thereto, and those skilled in the art may adjust the value according to actual needs.

[0102] Specifically, the agglomeration index of the material after the speed of the ball mill is increased is used to further determine whether the grinding meets the standards, among which,

[0103] If the agglomeration index is less than 5% of the preset agglomeration index, it is determined that the grinding meets the standard and the next step of processing is carried out;

[0104] If the agglomeration index is greater than or equal to the preset agglomeration index, it is determined that the grinding does not meet the standard, and the duration of ball milling is corrected according to the difference between the agglomeration index and the preset agglomeration index.

[0105] Specifically, the agglomeration index is measured according to HG / T 3820-2013 "Analysis Method for Synthetic Hydrotalcite".

[0106] Comparative Example

[0107] An embodiment of the present invention provides a process for preparing an air-purifying negative oxygen ion thermosetting powder coating, wherein the heating temperature of the second heating zone is 180° C., the screw rotation speed is 200 r / min, and the raw material particle size is 30 μm.

[0108] Example 1

[0109] An embodiment of the present invention provides a process for preparing an air-purifying negative oxygen ion thermosetting powder coating, wherein the heating temperature of the second heating zone is 185° C., the screw rotation speed is 200 r / min, and the raw material particle size is 30 μm.

[0110] Example 2

[0111] An embodiment of the present invention provides a process for preparing an air-purifying negative oxygen ion thermosetting powder coating, wherein the heating temperature of the second heating zone is 190° C., the screw rotation speed is 200 r / min, and the raw material particle size is 30 μm.

[0112] Example 3

[0113] An embodiment of the present invention provides a process for preparing an air-purifying negative oxygen ion thermosetting powder coating, wherein the heating temperature of the second heating zone is 195° C., the screw rotation speed is 200 r / min, and the raw material particle size is 30 μm.

[0114] Example 4

[0115] An embodiment of the present invention provides a process for preparing an air-purifying negative oxygen ion thermosetting powder coating, wherein the heating temperature of the second heating zone is 195° C., the screw rotation speed is 300 r / min, and the raw material particle size is 30 μm.

[0116] Example 5

[0117] An embodiment of the present invention provides a process for preparing an air-purifying negative oxygen ion thermosetting powder coating, wherein the heating temperature of the second heating zone is 195° C., the screw rotation speed is 400 r / min, and the raw material particle size is 30 μm.

[0118] Example 6

[0119] An embodiment of the present invention provides a process for preparing an air-purifying negative oxygen ion thermosetting powder coating, wherein the heating temperature of the second heating zone is 195° C., the screw rotation speed is 500 r / min, and the raw material particle size is 30 μm.

[0120] Example 7

[0121] An embodiment of the present invention provides a process for preparing an air-purifying negative oxygen ion thermosetting powder coating, wherein the heating temperature of the second heating zone is 195° C., the screw rotation speed is 400 r / min, and the raw material particle size is 20 μm.

[0122] Example 8

[0123] An embodiment of the present invention provides a process for preparing an air-purifying negative oxygen ion thermosetting powder coating, wherein the heating temperature of the second heating zone is 195° C., the screw rotation speed is 400 r / min, and the raw material particle size is 15 μm.

[0124] Example 9

[0125] An embodiment of the present invention provides a process for preparing an air-purifying negative oxygen ion thermosetting powder coating, wherein the heating temperature of the second heating zone is 195° C., the screw rotation speed is 400 r / min, and the raw material particle size is 10 μm.

[0126] The product fineness and negative oxygen ion release of the comparative example, embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, embodiment 6, embodiment 7, embodiment 8 and embodiment 9 were respectively detected, and the specific results are shown in the following table:

[0127] Fineness(μm) <![CDATA[Negative oxygen ion release amount / (pcs / cm 3 )]]> Comparative Example 28.95 3546 Example 1 28.63 3892 Example 2 28.21 4375 Example 3 27.75 5086 Example 4 26.88 6713 Example 5 26.13 7860 Example 6 25.68 6923 Example 7 18.50 7980 Example 8 12.45 8025 Example 9 8.85 8032

[0128] 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.

[0129] 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 preparation process for air-purifying negative oxygen ion thermosetting powder coating, characterized in that: include: Step S1, stirring and mixing a thermosetting resin, a curing agent, a filler, a pigment and a plastic additive in a mixing tank according to a first preset ratio; Step S2, extruding the mixed thermosetting resin mixture through a screw extruder and pressing the molten mixture into mixed tablets through a cooling tablet press; Step S3, judging whether the mixing of the thermosetting resin mixture meets the preset standard according to the cross-sectional variation coefficient value of the mixed material sheet, if not meeting the preset standard, judging whether the mixing of the thermosetting resin mixture meets the preset standard for the second time according to the extrusion flow rate, or increasing the heating temperature of the second heating zone of the screw extruder; Step S4, crushing the mixed material flakes that meet the preset standards and grinding them with a ball mill to obtain thermosetting resin mixed material powder; Step S5, judging whether the grinding meets the preset standard according to the particle size uniformity evaluation value of the thermosetting resin mixture powder, if it does not meet the preset standard, increasing the speed of the ball mill, or reducing the ratio of the material to the ball milling balls in the ball mill; Step S6, mixing and grinding the mixed material powder that meets the preset standard and the negative ion synthetic powder according to a second preset ratio; Step S7, sieving the ground negative ion mixed powder to obtain negative oxygen ion thermosetting powder coating.

2. The preparation process of the air-purifying negative oxygen ion thermosetting powder coating according to claim 1, characterized in that: According to the cross-sectional variation coefficient value of the mixed material sheet, it is determined whether the mixing of the thermosetting resin mixture meets the preset standard, wherein: If the cross-sectional variation coefficient value is less than the first preset cross-sectional variation coefficient value, it is determined that the mixing of the thermosetting resin mixture meets the preset standard, and the next step of processing is performed; If the cross-sectional variation coefficient value is greater than or equal to the first preset cross-sectional variation coefficient value and less than the second preset cross-sectional variation coefficient value, it is determined that the mixing of the thermosetting resin mixture does not meet the preset standard, and a secondary determination is made based on the extrusion flow rate whether the mixing of the thermosetting resin mixture meets the preset standard; If the cross-sectional variation coefficient value is greater than or equal to the second preset cross-sectional variation coefficient value, it is determined that the mixing of the thermosetting resin mixture does not meet the preset standard, and the heating temperature of the second heating zone of the screw extruder is increased according to the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value.

3. The preparation process of the air-purifying negative oxygen ion thermosetting powder coating according to claim 2, characterized in that: A secondary determination is made based on the extrusion flow rate whether the mixing of the thermosetting resin mixture meets the preset standard, wherein: If the extrusion flow rate is less than a preset extrusion flow rate, it is determined that the mixing of the thermosetting resin mixture does not meet a preset standard, and the rotation speed of the screw is increased according to the difference between the preset extrusion flow rate and the extrusion flow rate; If the extrusion flow rate is greater than or equal to the preset extrusion flow rate, it is determined that the mixing of the thermosetting resin mixture meets the preset standard, and the next step of processing is performed.

4. The preparation process of the air-purifying negative oxygen ion thermosetting powder coating according to claim 3, characterized in that: Increasing the heating temperature of the second heating zone of the screw extruder according to the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value comprises: If the cross-sectional variation coefficient value difference is less than the first preset variation coefficient value difference, the heating temperature of the second heating zone of the screw extruder is adjusted to a corresponding value using the first temperature adjustment coefficient; If the cross-sectional variation coefficient value difference is greater than or equal to the first preset variation coefficient value difference and less than the second preset variation coefficient value difference, the heating temperature of the second heating zone of the screw extruder is adjusted to a corresponding value using the second temperature adjustment coefficient; If the cross-sectional variation coefficient value difference is greater than or equal to the second preset variation coefficient value difference, the heating temperature of the second heating zone of the screw extruder is adjusted to a corresponding value using a third temperature adjustment coefficient; The cross-sectional variation coefficient value difference is the difference between the cross-sectional variation coefficient value and the second preset cross-sectional variation coefficient value.

5. The preparation process of the air-purifying negative oxygen ion thermosetting powder coating according to claim 4, characterized in that: The adjustment range of the screw rotation speed is positively correlated with the extrusion flow rate difference, wherein the extrusion flow rate difference is the difference between the preset extrusion flow rate and the extrusion flow rate.

6. The preparation process of the air-purifying negative oxygen ion thermosetting powder coating according to claim 5, characterized in that: Judging the eligibility of the temperature regulation of the second heating zone of the screw extruder according to the cross-sectional variation coefficient value includes: If the cross-sectional variation coefficient value is less than the preset cross-sectional variation coefficient value, it is determined that the temperature regulation of the second heating zone of the screw extruder is qualified; If the cross-sectional variation coefficient value is greater than or equal to the preset cross-sectional variation coefficient value, the temperature regulation of the second heating zone of the screw extruder is determined to be unqualified, and the raw material particle size is reduced according to the difference between the cross-sectional variation coefficient value and the preset cross-sectional variation coefficient value.

7. The preparation process of the air-purifying negative oxygen ion thermosetting powder coating according to claim 6, characterized in that: The particle size uniformity evaluation value is used to determine whether the grinding meets the preset standard, where: If the particle size uniformity evaluation value is less than the first preset particle size uniformity evaluation value, it is determined that the grinding meets the preset standard and the next step of processing is performed; If the particle size uniformity evaluation value is greater than or equal to the first preset particle size uniformity evaluation value and less than the second preset particle size uniformity evaluation value, it is determined that the grinding does not meet the preset standard, and the rotation speed of the ball mill is increased according to the difference between the particle size uniformity evaluation value and the first preset particle size uniformity evaluation value; If the particle size uniformity evaluation value is greater than or equal to the second preset particle size uniformity evaluation value, it is determined that the grinding does not meet the preset standard, and the ratio of material to ball milling balls in the ball mill is reduced according to the difference between the particle size uniformity evaluation value and the second preset particle size uniformity evaluation value.

8. The preparation process of the air-purifying negative oxygen ion thermosetting powder coating according to claim 7, characterized in that: The particle size uniformity evaluation value is determined by the average particle size and particle size variance of the material powder after ball milling.

9. The preparation process of the air-purifying negative oxygen ion thermosetting powder coating according to claim 8, characterized in that: Several ratio adjustment methods are provided for reducing the ratio of material to ball milling balls in the ball mill, and each ratio adjustment method has a different adjustment range for the ratio of material to ball milling balls.

10. The process for preparing the air-purifying negative oxygen ion thermosetting powder coating according to claim 9, characterized in that: The agglomeration index of the material after the speed of the ball mill is increased is used to determine whether the grinding meets the standard. If the agglomeration index is less than the preset agglomeration index, it is determined that the grinding meets the standard and the next step of processing is performed; If the agglomeration index is greater than or equal to the preset agglomeration index, it is determined that the grinding does not meet the standard, and the duration of ball milling is corrected according to the difference between the agglomeration index and the preset agglomeration index.

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