CN116004121B - High-viscosity powder coating and preparation method and application thereof - Google Patents
High-viscosity powder coating and preparation method and application thereof Download PDFInfo
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- CN116004121B CN116004121B CN202211584395.5A CN202211584395A CN116004121B CN 116004121 B CN116004121 B CN 116004121B CN 202211584395 A CN202211584395 A CN 202211584395A CN 116004121 B CN116004121 B CN 116004121B
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- 238000000576 coating method Methods 0.000 title claims abstract description 48
- 239000011248 coating agent Substances 0.000 title claims abstract description 45
- 239000000843 powder Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000003822 epoxy resin Substances 0.000 claims abstract description 41
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 41
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 34
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims abstract description 30
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003054 catalyst Substances 0.000 claims abstract description 20
- 229920002678 cellulose Polymers 0.000 claims abstract description 20
- 239000001913 cellulose Substances 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims abstract description 17
- 239000000049 pigment Substances 0.000 claims abstract description 17
- 244000028419 Styrax benzoin Species 0.000 claims abstract description 15
- 235000000126 Styrax benzoin Nutrition 0.000 claims abstract description 15
- 235000008411 Sumatra benzointree Nutrition 0.000 claims abstract description 15
- 229960002130 benzoin Drugs 0.000 claims abstract description 15
- 235000019382 gum benzoic Nutrition 0.000 claims abstract description 15
- 238000005282 brightening Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims description 13
- 239000001993 wax Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 8
- 239000004841 bisphenol A epoxy resin Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- YSWBFLWKAIRHEI-UHFFFAOYSA-N 4,5-dimethyl-1h-imidazole Chemical group CC=1N=CNC=1C YSWBFLWKAIRHEI-UHFFFAOYSA-N 0.000 claims description 3
- 229920008347 Cellulose acetate propionate Polymers 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 150000008064 anhydrides Chemical class 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- 229920002301 cellulose acetate Polymers 0.000 claims description 3
- 229920006217 cellulose acetate butyrate Polymers 0.000 claims description 3
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical group NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 3
- 238000007142 ring opening reaction Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- WTUTXGGXSHMISM-UHFFFAOYSA-N 2-acetyloxyacetic acid;butanoic acid Chemical compound CCCC(O)=O.CC(=O)OCC(O)=O WTUTXGGXSHMISM-UHFFFAOYSA-N 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 abstract description 10
- 238000011161 development Methods 0.000 abstract description 9
- 239000010705 motor oil Substances 0.000 abstract description 9
- 230000030279 gene silencing Effects 0.000 abstract description 6
- 239000003595 mist Substances 0.000 abstract 1
- 239000007921 spray Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 239000003623 enhancer Substances 0.000 description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 239000003973 paint Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- UGZICOVULPINFH-UHFFFAOYSA-N acetic acid;butanoic acid Chemical compound CC(O)=O.CCCC(O)=O UGZICOVULPINFH-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Paints Or Removers (AREA)
Abstract
The application discloses a high-viscosity powder coating, a preparation method and application thereof, and relates to the technical field of powder coatings. The high-viscosity powder coating comprises the following components in parts by weight: 50-60 parts of modified epoxy resin; 2-3 parts of polar curing agent; 0.1-0.5 part of catalyst; 0.5-1 part of brightening agent; 0.2-0.5 part of benzoin; 0.5-1 part of pigment; 20-50 parts of filler; wherein the modified epoxy resin is prepared by reacting bisphenol A type epoxy resin with high-surface Zhang Lila and high-hydroxyl cellulose. The high-adhesion powder coating can be applied to the brake pad backboard, can not only ensure the requirements of salt mist resistance, engine oil resistance and the like of the brake pad backboard, but also enable the silencing sheet not to fall off easily, and has excellent development prospect.
Description
Technical Field
The application relates to the technical field of powder coatings, in particular to a high-viscosity powder coating and a preparation method and application thereof.
Background
In recent years, with the rapid development of the automotive industry in China, brake pad manufacturers are also developing synchronously, and about 5 hundred million sets of brake pads are required annually in China. In order to ensure that the rust resistance of the metal shell of the brake pad meets the requirements, paint or powder coating is generally used for coating. The paint has the advantages of convenient coating and construction by adopting a brushing or spraying process, and has the defects that the paint is solvent type paint, contains organic volatile matters, pollutes the environment and causes harm to the health of constructors, and simultaneously causes waste of a large amount of solvents. For this reason, enterprises are looking for a coating process that can replace the traditional paint spraying.
The powder coating has the characteristics of energy conservation, environmental protection, no VOC emission, good decoration, safe use and the like, and in recent years, the development of the domestic powder coating technology rapidly and gradually becomes the selection direction of enterprises, and the development trend of the related industries of coating is that the paint is changed into powder.
Vehicles such as automobiles generate loud noise during braking. In order to effectively reduce the volume of noise generated during braking of automobiles, more and more automobile braking systems now start to apply sound deadening sheets. The noise damping sheets are various in variety and different in connection mode with the friction block backboard. One of them is directly stuck on the back plate of the brake block, if the sticking strength is insufficient during braking, the connection with the friction block is loose, the noise reduction effect is affected, even the noise reduction sheet falls off, and the noise reduction effect is not achieved during braking.
Therefore, the development of the powder coating with high viscosity for the brake pad backboard is needed to be carried out, so that the requirements of salt spray resistance, engine oil resistance and the like of the brake pad backboard can be met, and the sound-deadening sheet can be prevented from falling off easily.
Disclosure of Invention
The application aims to provide a high-viscosity powder coating, a preparation method and application thereof, which are used for a brake block backboard, can ensure the requirements of salt spray resistance, engine oil resistance and the like of the brake block backboard, and can also ensure that a silencing sheet is not easy to fall off.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical scheme: the high-viscosity powder coating comprises the following components in parts by weight: 50-60 parts of modified epoxy resin; 2-3 parts of polar curing agent; 0.1-0.5 part of catalyst; 0.5-1 part of brightening agent; 0.2-0.5 part of benzoin; 0.5-1 part of pigment; 20-50 parts of filler; wherein the modified epoxy resin is prepared by reacting bisphenol A type epoxy resin with high-surface Zhang Lila and high-hydroxyl cellulose.
In the technical scheme, the bisphenol A type epoxy resin is modified through the high surface Zhang Lila and the high hydroxyl cellulose, so that the bisphenol A type epoxy resin has high polarity and high surface tension, and the polar curing agent and the catalyst are selected to enable the powder coating to increase the binding force with the substrate in the curing process, so that the high surface tension of the surface of the powder coating is ensured, and the high binding force of the surface is further endowed. The high-adhesion powder coating provided by the invention can be applied to the back plate of the brake block, can not only ensure the salt spray resistance, engine oil resistance and other requirements of the back plate of the brake block, but also ensure that the silencing plate is not easy to fall off, and has excellent development prospect.
Further, according to an embodiment of the present application, the structure of the modified epoxy resin is as follows:
further in accordance with embodiments of the present application, wherein the high surface tension wax is selected from polyamide waxes or anhydride grafted polypropylene waxes.
Further, according to the embodiment of the present application, the amount of the high surface tension wax added is 0.5 to 2wt% of the bisphenol a type epoxy resin.
Further, according to an embodiment of the present application, wherein the high hydroxyl cellulose is selected from one or a combination of several of cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, and cellulose carboxymethyl acetate butyrate.
Further, according to the embodiment of the application, the addition amount of the high-hydroxyl cellulose is 3-5wt% of the bisphenol A type epoxy resin.
Further, according to an embodiment of the present application, wherein the polar curing agent is a dicyandiamide curing agent.
Further, according to an embodiment of the present application, wherein the catalyst is dimethylimidazole.
Further, according to an embodiment of the present application, wherein the pigment is carbon black.
Further, in accordance with an embodiment of the present application, wherein the filler comprises silica and barium sulfate.
In order to achieve the above purpose, the embodiment of the application also discloses a preparation method of the high-viscosity powder coating, which comprises the following steps:
and (3) feeding and mixing: weighing corresponding modified epoxy resin, polar curing agent, catalyst, brightening agent, benzoin, pigment and filler according to parts by weight, and putting into a mixer for uniform mixing;
melt extrusion: melting and mixing the raw materials and extruding the raw materials by an extruder;
tabletting and crushing: the extruded backing material is pressed into sheets by a tablet press, the sheet backing material is crushed by a crusher, and finally the backing material is crushed by a crusher.
Further, according to the embodiment of the application, the modified epoxy resin is prepared by the following method: adding bisphenol A epoxy resin and high surface tension wax into a reaction kettle, performing ring opening reaction by adopting quaternary ammonium salt to obtain an intermediate, adding high-hydroxyl cellulose to perform grafting reaction, controlling the temperature to be 180-200 ℃ and the pressure to be 20-0.5 Kpa in vacuum.
In order to achieve the above purpose, the embodiment of the application also discloses application of the high-viscosity powder coating to a brake pad.
Compared with the prior art, the application has the following beneficial effects: the bisphenol A epoxy resin is modified through the high surface Zhang Lila and the high hydroxyl cellulose, so that the bisphenol A epoxy resin has high polarity and high surface tension, and the polar curing agent and the catalyst are selected to enable the powder coating to increase the binding force with a substrate in the curing process, so that the high surface tension of the surface of the powder coating is ensured, and the high binding force of the surface of the powder coating is further endowed. The high-adhesion powder coating provided by the invention can be applied to the back plate of the brake block, can not only ensure the salt spray resistance, engine oil resistance and other requirements of the back plate of the brake block, but also ensure that the silencing plate is not easy to fall off, and has excellent development prospect.
Detailed Description
In order to make the objects, technical solutions, and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail. It should be understood that the specific embodiments described herein are some, but not all, embodiments of the present invention, are intended to be illustrative only and not limiting of the embodiments of the present invention, and that all other embodiments obtained by persons of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," "horizontal," and the like are merely for convenience of description and to simplify the description, but do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "a," an, "" the first, "" the second, "" the third, "" the fourth, "" the fifth, "and the sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
For purposes of brevity and description, the principles of the embodiments are described primarily by reference to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one of ordinary skill in the art that the embodiments may be practiced without limitation to these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.
The application discloses high-viscosity powder coating is applied to a brake block backboard, so that the requirements of salt spray resistance, engine oil resistance and the like of the brake block backboard can be met, and the noise reduction sheet can be prevented from falling off easily. Specifically, the high-adhesion powder coating comprises modified epoxy resin, a polar curing agent, a catalyst, a brightening agent, benzoin, pigment and filler.
Wherein the addition amount of the modified epoxy resin is 50-60 parts by weight, and the modified epoxy resin is prepared by reacting bisphenol A type epoxy resin with high surface Zhang Lila and high hydroxyl cellulose. Specifically, the high surface tension wax is selected from polyamide wax or anhydride grafted polypropylene wax, and the addition amount is 0.5-2wt% of the bisphenol A type epoxy resin; the high-hydroxyl cellulose is selected from one or more of cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate and carboxymethyl cellulose acetate butyrate, and the addition amount of the high-hydroxyl cellulose is 3-5wt% of the bisphenol A type epoxy resin. The high surface tension wax and the high hydroxyl cellulose react with the epoxy groups of the bisphenol A type epoxy resin to form a modified epoxy resin with the following structure:
in the technical scheme, the bisphenol A type epoxy resin is modified through the high surface Zhang Lila and the high hydroxyl cellulose, so that the bisphenol A type epoxy resin has high polarity and high surface tension, and the polar curing agent and the catalyst are selected to enable the powder coating to increase the binding force with a substrate in the curing process, so that the high surface tension of the surface of the powder coating is ensured, and the high binding force of the surface of the powder coating is further endowed. The high-adhesion powder coating provided by the invention can be applied to the back plate of the brake block, can not only ensure the salt spray resistance, engine oil resistance and other requirements of the back plate of the brake block, but also ensure that the silencing plate is not easy to fall off, and has excellent development prospect.
Next, the polar curing agent is added in an amount of 2 to 3 parts by weight, preferably using a dicyandiamide curing agent. The catalyst is added in an amount of 0.1 to 0.5 parts by weight, preferably dimethylimidazole. The addition amount of the brightening agent is 0.5-1 weight part; the addition amount of benzoin is 0.2-0.5 weight parts. The pigment is added in an amount of 0.5 to 1 part, specifically carbon black. The filler is added in an amount of 20-50 parts and comprises silicon dioxide and barium sulfate, and the mass ratio of the silicon dioxide to the barium sulfate is 4:6 to achieve optimal gloss.
Further, the application also discloses a preparation method of the high-viscosity powder coating, which comprises the following steps:
and (3) feeding and mixing: weighing corresponding modified epoxy resin, polar curing agent, catalyst, brightening agent, benzoin, pigment and filler according to parts by weight, and putting into a mixer for uniform mixing;
melt extrusion: melting and mixing the raw materials and extruding the raw materials by an extruder;
tabletting and crushing: the extruded backing material is pressed into sheets by a tablet press, the sheet backing material is crushed by a crusher, and finally the backing material is crushed by a crusher.
The modified epoxy resin is prepared by the following method: adding bisphenol A epoxy resin and high surface tension wax into a reaction kettle, performing ring opening reaction by adopting quaternary ammonium salt to obtain an intermediate, adding high-hydroxyl cellulose to perform grafting reaction, controlling the temperature to be 180-200 ℃ and the pressure to be 20-0.5 Kpa in vacuum.
The following will further illustrate the technical aspects of the present application by way of examples and comparative examples, but the present application is not limited to these examples.
[ example 1 ]
52 parts by weight of modified epoxy resin, 2.2 parts by weight of polar curing agent, 0.3 part by weight of catalyst, 0.6 part by weight of brightening agent, 0.3 part by weight of benzoin, 0.8 part by weight of pigment and 40.3 parts by weight of filler are weighed according to parts by weight; the raw materials are put into a mixer for mixing; mixing the raw materials up and down by using a Mirck mixer for 10-22min, wherein the high-speed mixing rotating speed is 330r/min; melting and mixing the raw materials and extruding the raw materials by an extruder; tabletting: pressing the extruded backing material into a sheet shape by a tablet press; crushing the flaky substrate by using a crusher; crushing the base material by a crusher; screening by a rotary screen to obtain powder coating, and packaging the coating into boxes. Wherein the screw rotation degree of the extruder is 45Hz, the temperature is controlled at 70-85 ℃, and the temperature of a discharge hole of the extruder is not higher than 100 ℃.
[ example 2 ]
This example differs from example 1 in that 53 parts by weight of the modified epoxy resin, 2.3 parts by weight of the polar curing agent, 0.3 parts by weight of the catalyst, 0.6 parts by weight of the gloss enhancer, 0.3 parts by weight of the benzoin, 0.8 parts by weight of the pigment, 39 parts by weight of the filler were weighed, and the remainder remained the same as in example 1.
[ example 3 ]
The example differs from example 1 in that 54 parts by weight of the modified epoxy resin, 2.4 parts by weight of the polar curing agent, 0.3 parts by weight of the catalyst, 0.6 parts by weight of the gloss enhancer, 0.3 parts by weight of the benzoin, 0.8 parts by weight of the pigment, 38.1 parts by weight of the filler were weighed, and the remainder remained the same as in example 1.
[ example 4 ]
The example is different from example 1 in that 55 parts by weight of the modified epoxy resin, 2.5 parts by weight of the polar curing agent, 0.3 parts by weight of the catalyst, 0.6 parts by weight of the gloss enhancer, 0.3 parts by weight of benzoin, 0.8 parts by weight of the pigment, 37.1 parts by weight of the filler are weighed, and the remainder is kept the same as example 1.
[ example 5 ]
The example is different from example 1 in that 58 parts by weight of the modified epoxy resin, 2.6 parts by weight of the polar curing agent, 0.3 parts by weight of the catalyst, 0.6 parts by weight of the gloss enhancer, 0.3 parts by weight of the benzoin, 0.8 parts by weight of the pigment, 34 parts by weight of the filler are weighed, and the remainder is kept the same as example 1.
Comparative example 1
This comparative example differs from example 1 in that 50 parts by weight of bisphenol a type epoxy resin (unmodified), 2 parts by weight of curing agent TGIC, 0.3 parts by weight of catalyst, 0.6 parts by weight of gloss enhancer, 0.3 parts by weight of benzoin, 0.8 parts by weight of pigment, 43.3 parts by weight of filler were weighed, and the remainder remained the same as in example 1.
Comparative example 2
This comparative example differs from example 1 in that 60 parts by weight of bisphenol a type epoxy resin (unmodified), 3 parts by weight of curing agent TGIC, 0.3 parts by weight of catalyst, 0.6 parts by weight of gloss enhancer, 0.3 parts by weight of benzoin, 0.8 parts by weight of pigment, 32.3 parts by weight of filler were weighed, and the remainder remained the same as in example 1.
For the above examples and comparative examples, salt spray resistance, oil resistance, hardness and vibration damping sheet adhesion strength were measured, and the test structures are shown in table 1.
TABLE 1
As shown in Table 1, in the embodiment 1-5, bisphenol A epoxy resin is modified by high-surface Zhang Lila and high-hydroxyl cellulose, and a polar curing agent is selected, compared with the comparative embodiment 1-2 using unmodified bisphenol A epoxy resin and a common curing agent, the modified epoxy resin has higher salt spray resistance and engine oil resistance, the bonding strength of the shockproof sheet can be maintained above 3.1N/mm and can reach 3.5N/mm at most, so that the high-adhesion powder coating can be applied to a back plate of a brake pad, not only can ensure the requirements of salt spray resistance, engine oil resistance and the like of the back plate of the brake pad, but also can ensure that the silencing sheet is not easy to fall off, and has excellent development prospect.
While the foregoing has been described in terms of illustrative embodiments thereof, so that those skilled in the art may appreciate the present application, it is not intended to be limited to the precise embodiments so that others skilled in the art may readily utilize the present application to its various modifications and variations which are within the spirit and scope of the present application as defined and determined by the appended claims.
Claims (9)
1. The high-viscosity powder coating is characterized by comprising the following components in parts by weight:
50-60 parts of modified epoxy resin;
2-3 parts of polar curing agent;
0.1-0.5 part of catalyst;
0.5-1 part of brightening agent;
0.2-0.5 part of benzoin;
0.5-1 part of pigment;
20-50 parts of filler;
wherein the modified epoxy resin is formed by reacting bisphenol A type epoxy resin with high-surface Zhang Lila and high-hydroxyl cellulose;
the modified epoxy resin is prepared by the following method: adding bisphenol A epoxy resin and high surface tension wax into a reaction kettle, performing ring opening reaction by adopting quaternary ammonium salt to obtain an intermediate, adding high-hydroxyl cellulose to perform grafting reaction, controlling the temperature to be 180-200 ℃ and the pressure to be 20-0.5 kPa in vacuum;
the addition amount of the high surface tension wax is 0.5-2wt% of the bisphenol A type epoxy resin;
the addition amount of the high-hydroxyl cellulose is 3-5wt% of the bisphenol A type epoxy resin;
the high surface Zhang Lila is selected from anhydride grafted polypropylene waxes.
2. The high adhesion powder coating of claim 1, wherein the modified epoxy resin has the structure:
3. the high-viscosity powder coating according to claim 1, wherein the high-hydroxyl cellulose is one or a combination of several of cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, and cellulose carboxymethyl acetate butyrate.
4. The high tack powder coating of claim 1, wherein the polar curing agent is a dicyandiamide curing agent.
5. A high adhesion powder coating as recited in claim 1, wherein the catalyst is dimethylimidazole.
6. A high adhesion powder coating as recited in claim 1, wherein the pigment is carbon black.
7. A high adhesion powder coating as recited in claim 1, wherein the filler comprises silica and barium sulfate.
8. A method of preparing the high adhesion powder coating of claim 1, comprising the steps of:
and (3) feeding and mixing: weighing corresponding modified epoxy resin, polar curing agent, catalyst, brightening agent, benzoin, pigment and filler according to parts by weight, and putting into a mixer for uniform mixing;
melt extrusion: melting and mixing the raw materials and extruding the raw materials by an extruder;
tabletting and crushing: the extruded backing material is pressed into sheets by a tablet press, the sheet backing material is crushed by a crusher, and finally the backing material is crushed by a crusher.
9. Use of a high-adhesion powder coating according to any one of claims 1 to 7 or a high-adhesion powder coating obtainable by a process for the preparation of a high-adhesion powder coating according to claim 8 in a brake pad.
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