CN114507471B - Intermediate coating for wet-on-wet coating process and preparation method and application thereof - Google Patents
Intermediate coating for wet-on-wet coating process and preparation method and application thereof Download PDFInfo
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- CN114507471B CN114507471B CN202210312652.3A CN202210312652A CN114507471B CN 114507471 B CN114507471 B CN 114507471B CN 202210312652 A CN202210312652 A CN 202210312652A CN 114507471 B CN114507471 B CN 114507471B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention belongs to the technical field of high polymer coatings, and particularly relates to a floating coat coating for a wet-on-wet coating process, and a preparation method and application thereof. The middle coating provided by the invention comprises a component A and a component B, wherein the component A comprises raw materials such as modified hydroxyl acrylic resin, hyperbranched polyester resin, PMA, BAC, a dispersing agent, a siloxane-based coupling agent, superfine talcum powder, superfine barium sulfate, titanium dioxide, superfine silicon powder, modified bentonite, fumed silica and the like. The obtained product has excellent adhesive force, the adhesive force can reach 0 grade when the surface of an electrophoresis layer and atomic ash is checked, and the product has high filling property; the surface is dried for 20-30min at room temperature, so that the 2K finish paint can be directly coated by adopting a wet-on-wet process, the fullness and the glossiness of the finish paint are obviously improved, the process time is greatly shortened, and the production benefit is improved; meanwhile, the invention has an ultra-low VOC emission value, and is more environment-friendly and energy-saving.
Description
Technical Field
The invention belongs to the technical field of high polymer coatings, and particularly relates to a floating coat coating for a wet-on-wet coating process, and a preparation method and application thereof.
Background
The intermediate layer coating is a coating used for an intermediate coating between a primer layer and a finish layer, and can create a good substrate for the finish layer by improving the flatness of the surface of a vehicle body and the primer layer, so that the decoration of the coating is improved. The middle coating is different from the primer, and firstly, the middle coating needs to have excellent impact resistance and filling performance so as to respond to the impact of broken stones on the surface of a vehicle body and fill up the electrophoretic surface; and secondly, the electrophoretic paint can be better protected by having good isolation capability and certain isolation capability to the environment temperature of severe winter and severe summer outside the automobile body. Therefore, the requirements on the adhesion, filling property and the like of the intermediate coating are high, and particularly, the requirements on the performance of the intermediate coating in a wet-on-wet process are high.
The existing oily bus intermediate coat products on the market are all required to be baked under a high-thickness film and coated with finish paint after being polished, and the VOC emission value is higher than 420g/L.
Scholars Huang Junya published studies: "development of high-temperature intermediate coating matched with bi-component finish paint" (author: huang Junya; publication source: automobile process and material; publication time: 2010-10-20), wherein the coating process of the traditional self-drying intermediate coating matched bi-component finish paint and the high-temperature intermediate coating matched high-temperature finish paint is changed into the coating process of the high-temperature intermediate coating matched bi-component finish paint, but the new process has the problem of poor adhesive force between the intermediate coating and the finish paint; meanwhile, the formula and the construction application of the high-temperature intermediate coating matched with the bi-component finish paint are researched, and the elastic resin is added into the high-temperature intermediate coating matched with the bi-component finish paint to achieve the effect of excellent adhesive force among coatings, but the intermediate coating obtained by the formula still needs to be baked for 30min at 140 ℃ and polished to coat the finish paint.
Scholars Wang Hui published studies: the research on the high-temperature recoating adhesion of the water-based paint for the automobile (author: wang Hui; publication source: shanghai paint; publication time: 2020-07-31) discusses the problem that after the water-based automobile paint is baked at high temperature, the varnish is highly crosslinked, and when recoating is carried out, the intercoat paint and the colored paint are adhered to the upper layer of the intercoat paint, so that the difficulty is great, and the adhesion between the intercoat paint and the primer paint and the top paint is improved by adding talc powder slurry or organic phosphate A into the formulation of the intercoat paint. However, the method also needs high-temperature baking, and the surface drying time is as long as 24 hours.
Therefore, the requirement of providing the intermediate coating which meets the wet-on-wet process requirement, does not need baking, is quick to dry and has low VOC emission value is urgent.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a floating coat for a wet-on-wet coating process and a preparation method and application thereof. The primer surfacer provided by the invention has excellent adhesive force, the adhesive force can reach 0 level when the surface of an electrophoresis layer and atomic ash is checked, and the primer surfacer has high filling property (dry film is 40-60 um); the surface drying time at room temperature is 20-30min, the surface coating has the function of directly coating 2K finish by adopting a wet-on-wet process, the fullness and the glossiness of the finish are obviously improved, the process time is greatly shortened, and the production benefit is improved; meanwhile, the invention has an ultra-low VOC emission value, and is more environment-friendly and energy-saving.
The technical scheme of the invention is as follows:
a kind of wet-on-wet coating process uses the middle coating, the said middle coating includes A component and B component composition;
the component A comprises the following raw materials in parts by weight: 20-30 parts of hydroxy acrylic resin MACRYNAL ® SM 2704/75BACX, 5-11 parts of hyperbranched polyester resin, 2-5 parts of PMA (propylene glycol methyl ether acetate), 2-4 parts of BAC (n-butyl acetate), 0.5-1 part of dispersant, 1-3 parts of siloxane-based coupling agent, 2-12 parts of superfine talcum powder, 2-12 parts of superfine barium sulfate, 11-23 parts of titanium pigment, 2-6 parts of superfine silicon powder, 0.5-0.8 part of modified bentonite, 0.3-0.5 part of gas-phase silica, 0.2-0.4 part of carbon black, 0.1-0.5 part of flatting agent, 5-15 parts of dimethylbenzene and 0.01-0.03 part of drier;
the component B comprises the following raw materials in parts by weight: 40-50 parts of HDI curing agent, 20-30 parts of TDI curing agent, 10-30 parts of BAC and 10-30 parts of dimethylbenzene, and 0.1-0.3 part of dehydrating agent.
Further, the component A comprises the following raw materials in parts by weight: 25 parts of a hydroxyacrylic resin MACRYNAL ® SM 2704/75BACX, 11 parts of hyperbranched polyester resin, 2.5 parts of PMA, 4 parts of BAC, 1 part of dispersant, 1 part of siloxane-based coupling agent, 12 parts of superfine talcum powder, 12 parts of superfine barium sulfate, 20 parts of titanium dioxide, 3 parts of superfine silicon powder, 0.5 part of modified bentonite, 0.3 part of fumed silica, 0.2 part of carbon black, 0.3 part of flatting agent, 5 parts of dimethylbenzene and 0.01 part of drier.
The component B comprises the following raw materials in parts by weight: 27.55 parts of HDI curing agent, 22.45 parts of TDI curing agent, 25 parts of BAC,25 parts of xylene and 0.1 part of dehydrating agent.
Further, the weight ratio of the component A to the component B is 5-8:1; further, the ratio of the A component to the B component is 6:1.
further, the dispersant is BYK-110; the leveling agent is BYK-331; the siloxane-based coupling agent is Dow Corning 6040; the modified bentonite is a modesty hamming 828; the fumed silica is Yingchuang 972; the drier is air chemical T12.
Moreover, the invention also provides a preparation method of the floating coat for the wet-on-wet coating process, wherein the preparation method of the component A comprises the following steps:
step (1): sequentially adding the hydroxy acrylic resin MACRYNAL with the formula amount ® SM 2704/75BACX, hyperbranched polyester resin, PMA, BAC, xylene, a dispersant, superfine silica powder, superfine talcum powder, superfine barium sulfate, titanium dioxide, modified bentonite, fumed silica and carbon black, pre-dispersing at 900-1200 r/min, and grinding to the fineness of below 15um by using a horizontal sand mill to obtain slurry;
step (2): adding the leveling agent in the formula amount in the step (1) and stirring;
and (3): adding a formula amount of drier into the step (2), and stirring;
and (4): adding a silicone-based coupling agent with a formula amount into the step (3), and stirring to obtain the product;
the preparation method of the component B comprises the following steps:
mixing BAC, xylene and dehydrating agent, stirring, adding HDI curing agent and TDI curing agent, and stirring to obtain the final product.
Further, the preparation method of the component A in the preparation method comprises the following steps:
step (1): sequentially adding the hydroxy acrylic resin MACRYNAL with the formula amount ® SM 2704/75BACX, hyperbranched polyester resin, PMA, BAC, xylene, a dispersant, superfine silica powder, superfine talcum powder, superfine barium sulfate, titanium dioxide, modified bentonite, fumed silica and carbon black, and pre-dispersing at 900-1200 r/min, grinding to fineness below 15um by using a horizontal sand mill, and controlling the flow rate of powder in the horizontal sand mill to be 10-15L/min at a temperature below 50 ℃ to obtain slurry; the materials are ground and flow out under the conditions, so that the agglomeration of powder particles can be effectively reduced;
step (2): adding the leveling agent in the formula amount in the step (1), and stirring for 5-10min at 300-600 r/min;
and (3): adding a formula amount of drier into the step (2), and stirring for 5-10min at 300-600 r/min;
and (4): adding the silicone-based coupling agent with the formula amount in the step (3), stirring at 300-600 r/min for 5-10min to obtain the product;
the preparation method of the component B comprises the following steps:
mixing BAC, xylene and dehydrating agent, stirring at 300-600 rpm for 5min, adding HDI curing agent, and stirring TDI curing agent at 300-600 rpm for 15 min.
The invention also provides an application of the floating coat paint for the wet-on-wet coating process in preparing a paint for vehicles.
The invention is in hydroxy acrylic resin MACRYNAL ® PMA, BAC, ultrafine silicon powder, ultrafine barium sulfate, a siloxane-based coupling agent, modified bentonite, gas-phase silica and other raw materials are added into an SM 2704/75BACX and hyperbranched polyester resin system, so that in the process of forming a coating and drying the coating, after water is completely evaporated, all the raw material components are uniformly distributed on the surface of colloidal particles, and a film layer is formed by dissolving all the particles, thereby improving the construction adaptability of the coating system and the appearance of the coating, preventing the surface of the coating system from skinning, ensuring that the obtained floating coating has excellent performances of no baking, quick surface drying and the like, and having higher leveling property. In addition, in hydroxy acrylic resin MACRYNAL ® The additives such as BYK-331, superfine barium sulfate, BYK-110, siloxane-based coupling agent and the like are added into the SM 2704/75BACX and hyperbranched polyester resin system, so that the adhesive force and the water resistance of the floating coat paint can be remarkably improved. After the auxiliary agent is added into the system, the generated active groups are easily combined and intertwined with molecular chains in the system, so that a compact lamellar net structure is formed inside a coating film, and a penetration path of moisture is increased, thereby remarkably improving the adhesive force and water resistance of the floating coat.
The invention adopts high-solid hydroxyl acrylic resin MACRYNAL ® SM 2704/75BACX and SuperBACXThe branched polyester resin can achieve excellent water resistance and low voc emission value by using a viscosity-reducing dispersant BYK-110 and pigments and fillers with low oil absorption and lower mesh number on the basis; meanwhile, the proper pigment volume concentration, solvent type and silane coupling agent content are adjusted on the basis of the raw materials to control the shrinkage of a paint film, and meanwhile, the excellent appearance effect is ensured; in addition, dow Corning 6040 is used as a silane coupling agent and is matched with the component B for use, particularly, an HDI curing agent and a TDI curing agent are selected to be used as the curing agents together, so that the flexibility and interlayer adhesion of a paint film are greatly improved, the drying speed is accelerated, the obtained floating coat paint has excellent performances of no need of baking, quick surface drying and the like, and has high leveling property; finally, the effects of improving the flexibility of the paint film and improving the drying speed are achieved, the surface drying time at room temperature is 20-30min, and a wet-on-wet coating process can be directly adopted.
Compared with the prior art, the floating coat paint for the wet-on-wet coating process of the bus and the preparation method thereof provided by the invention have the following advantages:
(1) After the component A and the component B are matched with each other, the adhesion measured by marking on the surfaces of an electrophoresis layer and atomic ash is 0-1 grade, so that the intermediate coating obtained in the embodiment of the invention has excellent adhesion and high filling property (dry film is 40-60 um), and the surface drying time is 20-30min at room temperature, namely the intermediate coating has the function of directly coating 2K finish by adopting a wet-on-wet process; the intermediate coating belongs to a high-solid low-viscosity product, has extremely low VOC (volatile organic compounds) emission value, and is environment-friendly and efficient; the paint can be directly subjected to wet-on-wet coating with 2K finish paint, so that energy is greatly saved, the process time is shortened, and the production benefit is improved; and obviously improves the fullness and the glossiness of the finish (the composite coating gloss (60 DEG angle): 95.3 to 96.5%).
(2) The invention provides a floating coat for a wet-on-wet coating process, which has the excellent performances of no baking, quick surface drying and the like by adding raw materials such as PMA, BAC, superfine silicon powder, superfine barium sulfate, a siloxane-based coupling agent, modified bentonite, gas-phase silicon dioxide and the like; and in the hydroxy acrylic resin MACRYNAL ® SM 2704/75BACX, hyperbranched polyAuxiliary agents such as BYK-331, superfine barium sulfate, BYK-110, siloxane-based coupling agent and the like are added into the ester resin system, and the adhesion and the water resistance of the intermediate coating are also remarkably improved.
(3) In the traditional process of middle coating in the prior art, after the middle coating is sprayed, the middle coating needs to be baked for 30-60min at 70-80 ℃, manual polishing is needed after drying, and 2k finish coating can be carried out after polishing and dust removal. In the intermediate coating for the wet-on-wet coating process, the component A adopts high-solid hydroxyl acrylic resin MACRYNAL ® SM 2704/75BACX is matched with hyperbranched polyester resin, BYK-110 is used as a viscosity-reducing dispersant and a pigment filler with low oil absorption, and after the content of a silane coupling agent and the type of a solvent are adjusted, the flexibility of a paint film is effectively improved, the shrinkage of the paint film is controlled, the drying speed is greatly accelerated, and the appearance effect of the paint film can be ensured (the flatness and the gloss of the paint film can be directly influenced by the volatilization speed of the solvent, and the flatness of the paint film can be influenced by the too fast or too slow volatilization of the solvent, and the gloss of the paint film is reduced, so that the flatness and the gloss of the paint film can be ensured only by adopting a drying mode to level the paint film again under a heating condition in the conventional process), and the paint film is endowed with excellent water resistance and low VOC emission value; after the water-in-oil type intermediate coating and the component B are matched with each other for use, the intermediate coating for the wet-on-wet coating process can be directly coated with finish paint after being dried for 20-30min at room temperature, so that the energy consumption is reduced, the manufacturing period is greatly shortened, and the production cost is reduced.
Detailed Description
The present invention is further illustrated by the following description of specific embodiments, which are not intended to limit the invention, and various modifications and improvements can be made by those skilled in the art based on the basic idea of the invention, but the invention is within the protection scope of the invention.
The purchase information of the raw materials used in the invention is shown in the following table:
table 1 raw material purchase information table
Example 1 preparation of the intercoat coating for the Wet-on-Wet coating Process
The preparation method of the component A comprises the following steps:
step (1): adding 20 parts of hydroxyl acrylic resin MACRYNAL in turn ® SM 2704/75BACX, 5 parts of hyperbranched polyester resin, 2 parts of PMA, 2 parts of BAC, 5 parts of xylene, 0.5 part of BYK-110, 2 parts of superfine silica powder, 2 parts of superfine talcum powder, 2 parts of superfine barium sulfate, 11 parts of titanium dioxide, 0.5 part of modified bentonite, 0.3 part of fumed silica and 0.2 part of carbon black, pre-dispersing at 900 revolutions per minute, grinding by using a horizontal sand mill until the fineness is below 15 mu m, controlling the powder outflow condition to be below 50 ℃, and controlling the flow rate to be 10L/min to obtain slurry;
step (2): adding 0.1 part of BYK-331 into the step (1), and stirring for 5min at 300 revolutions per minute;
and (3): 0.01 part of drier air chemical T12 is added into the step (1), and the mixture is stirred for 5-10min at 300 r/min;
and (4): adding 1 part of siloxane-based coupling agent into the step (2), stirring at 300 r/min for 5min to obtain the product;
the preparation method of the component B comprises the following steps:
and (3) adding 10 parts of BAC, 10 parts of dimethylbenzene and 0.1 part of TI dehydrating agent into a cylinder, stirring at 300 revolutions/min for 5min, adding 40 parts of HDI curing agent and 20 parts of TDI curing agent, and stirring at 300 revolutions/min for 15min to obtain the modified HDI/TDI curing agent.
Example 2 preparation of the intercoat coating for the Wet-on-Wet coating Process
The preparation method of the component A comprises the following steps:
step (1): adding 30 parts of hydroxyl acrylic resin MACRYNAL in turn ® SM 2704/75BACX, 11 parts of hyperbranched polyester resin, 5 parts of PMA, 4 parts of BAC, 15 parts of xylene, BYK-110 parts, 6 parts of superfine silica powder, 12 parts of superfine talcum powder, 12 parts of superfine barium sulfate, 23 parts of titanium dioxide, 0.8 part of modified bentonite, 0.5 part of fumed silica, 0.4 part of carbon blackPre-dispersing at 1200 r/min, grinding with a horizontal sand mill until the fineness is below 15um, and controlling the powder flow condition to be below 50 ℃ and the flow rate to be 15L/min to obtain slurry;
step (2): 0.5 part of BYK-331 is added into the step (1), and the mixture is stirred for 10min at 600 revolutions per minute;
and (3): 0.03 part of drier air chemical T12 is added into the step (1), and stirring is carried out for 5-10min at 600 revolutions per minute;
and (4): adding 3 parts of siloxane-based coupling agent into the step (2), stirring at 600 rpm for 10min to obtain the product;
the preparation method of the component B comprises the following steps:
and (3) adding 20 parts of BAC, 30 parts of dimethylbenzene and 0.3 part of TI dehydrating agent into the cylinder, stirring for 5min at 600 revolutions/min, adding 50 parts of HDI curing agent and 30 parts of TDI curing agent, and stirring for 15min at 600 revolutions/min to obtain the special catalyst.
Example 3A method of preparing the intercoat coating for the Wet-on-Wet coating Process
The preparation method of the component A comprises the following steps:
step (1): adding 25 parts of hydroxyl acrylic resin MACRYNAL in sequence ® SM 2704/75BACX, 11 parts of hyperbranched polyester resin, 2.5 parts of PMA, 4 parts of BAC, 5 parts of xylene, BYK-110 parts, 3 parts of superfine silica powder, 12 parts of superfine talcum powder, 12 parts of superfine barium sulfate, 20 parts of titanium dioxide, 0.5 part of modified bentonite, 0.3 part of fumed silica and 0.2 part of carbon black, pre-dispersing at 1000 revolutions per minute, grinding by using a horizontal sand mill until the fineness is below 15 micrometers, controlling the outflow condition of powder to be below 50 ℃ and the flow rate to be 15L/min, and obtaining slurry;
step (2): adding 0.3 part of BYK-331 into the step (1), and stirring for 10min at 300 revolutions per minute;
and (3): 0.01 part of drier air chemical T12 is added into the step (1), and the mixture is stirred for 5-10min at 400 r/min;
and (4): adding 1 part of siloxane-based coupling agent into the step (2), stirring at 400 r/min for 10min to obtain the product;
the preparation method of the component B comprises the following steps:
and (3) adding 25 parts of BAC,25 parts of dimethylbenzene and 0.1 part of TI dehydrating agent into the cylinder, stirring for 5min at 400 revolutions/min, adding 27.55 parts of HDI curing agent and 22.45 parts of TDI curing agent, and stirring for 15min at 400 revolutions/min to obtain the catalyst.
Comparative example 1 preparation method of floating coat for wet-on-wet coating process
Comparative example 1 was prepared similarly to example 3, except that a hydroxy acrylic resin MACRYNAL was used ® SM 2704/75BACX replaces hyperbranched polyester resin.
Comparative example 2 preparation of the intercoat coating for the Wet-on-Wet coating Process
Comparative example 2 was prepared similarly to example 3, except that the hydroxyacrylic resin MACRYNAL was replaced by a hyperbranched polyester resin ® SM 2704/75BACX。
Comparative example 3 preparation method of intercoat coating for wet-on-wet coating process
The preparation method of comparative example 3 is similar to that of example 3, except that the component B adopts the following raw materials in parts by weight: 50 parts of HDI curing agent, 25 parts of BAC,25 parts of dimethylbenzene and 0.1 part of dehydrating agent, wherein TDI curing agent is not added.
Comparative example 4 preparation method of intercoat coating for wet-on-wet coating process
Comparative example 4 was prepared similarly to example 3, except that BAC (ethyl acetate) was used instead of PMA (propylene glycol methyl ether acetate).
Comparative example 5 preparation method of floating coat for wet-on-wet coating process
Comparative example 5 was prepared similarly to example 3 except that PMA (propylene glycol methyl ether acetate) was used instead of BAC (ethyl acetate).
Comparative example 6 preparation of the intercoat coating for the Wet-on-Wet coating Process
The production method of comparative example 6 is similar to that of example 3 except that in step (1), grinding was performed using a horizontal sand mill until the fineness was 50um or less, and the powder discharge condition was controlled to 30 ℃ or less and the flow rate was 15L/min, to obtain a slurry.
Test example one, performance test.
The test subjects were intercoat paints for wet-on-wet coating process obtained in example 1~3 and comparative example 1~6, in which test the a component and the B component were mixed in the weight ratio, respectively, and example 1 was carried out in the weight ratio of 5:1, mixing; example 2 the weight ratio of the component A to the component B is 8:1, mixing; comparative example 1~6 and example 3 were all prepared as a weight ratio of component a to component B of 6:1 and mixing.
The performance test was performed according to the following test method:
test "adhesion to electrophoretic panels, epoxy primers, putty" according to GB/T9286-1998; testing the water resistance of the composite coating according to GB/T5209-1985; "adhesion, grade" according to GB/T9286-1998; testing the adhesion of the composite coating according to GB/T5210-2006 GB/T9286-1998; "open time" was tested according to GB/T1728-2020; gloss was judged by measuring the relative reflectance at different angles with a gloss meter. That is, parallel light is projected onto a surface at an angle of 60 degrees, and light reflected from the surface at the same angle is measured to test "gloss of composite coating", and the gloss of a standard plate is defined as 100%, and then the percentage of a sample is measured; "VOC (g/L)" was tested in accordance with GB/T23985-2009.
The test results are shown in table 2.
TABLE 2 Performance test results for intercoat coatings
As can be seen from Table 1: the intermediate coating for the wet-on-wet coating process, which is obtained in the embodiment of the invention, has excellent adhesive force, the adhesive force is 0-1 grade in the cross-cut test on the surfaces of an electrophoresis layer and atomic ash, and the intermediate coating has high filling property; the intermediate coating belongs to a high-solid low-viscosity product, has extremely low VOC emission, is environment-friendly and efficient; and the paint is coated with 2K finish paint in a wet-on-wet manner, so that energy is saved; the fullness and the glossiness of the finish paint are obviously improved, the process time is greatly shortened, and the production benefit is improved.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. The floating coat paint for the wet-on-wet coating process is characterized by consisting of a component A and a component B; the component A consists of the following raw materials in parts by weight: 20-30 parts of hydroxy acrylic resin MACRYNAL SM 2704/75BACX, 5-11 parts of hyperbranched polyester resin, 2-5 parts of PMA, 2-4 parts of BAC, 0.5-1 part of dispersant, 1-3 parts of silane coupling agent, 2-12 parts of superfine talcum powder, 2-12 parts of superfine barium sulfate, 11-23 parts of titanium dioxide, 2-6 parts of superfine silica powder, 0.5-0.8 part of modified bentonite, 0.3-0.5 part of fumed silica, 0.2-0.4 part of carbon black, 0.1-0.5 part of flatting agent, 5-15 parts of dimethylbenzene and 0.01-0.03 part of drier;
the component B comprises the following raw materials in parts by weight: 40-50 parts of HDI curing agent, 20-30 parts of TDI curing agent, 10-30 parts of BAC, 10-30 parts of dimethylbenzene and 0.1-0.3 part of dehydrating agent;
the weight ratio of the component A to the component B is 5-8:1;
the silane coupling agent is Dow Corning 6040;
the dispersant is BYK-110; the leveling agent is BYK-331.
2. The floating coat according to claim 1, wherein the weight ratio of the a-component to the B-component is 6:1.
3. the intercoat coating for the wet-on-wet coating process of claim 1, wherein the modified bentonite is humming 828; the fumed silica is Yingchuang 972; the drier is air chemical T12.
4. A method of preparing a floating coat for a wet-on-wet coating process as claimed in any one of claims 1~3 wherein the preparation of component a comprises the steps of:
step (1): sequentially adding hydroxy acrylic resin MACRYNAL SM 2704/75BACX, hyperbranched polyester resin, PMA, BAC, dimethylbenzene, a dispersing agent, superfine silicon powder, superfine talcum powder, superfine barium sulfate, titanium dioxide, modified bentonite, fumed silica and carbon black according to the formula amount, pre-dispersing at 900-1200 revolutions/min, and grinding by using a horizontal sand mill until the fineness is below 15um to obtain slurry;
step (2): adding the leveling agent in the formula amount in the step (1), and stirring;
and (3): adding a formula amount of drier in the step (2), and stirring;
and (4): adding a silane coupling agent with a formula amount in the step (3), and stirring to obtain the silane coupling agent; the preparation method of the component B comprises the following steps: mixing BAC, xylene and dehydrating agent, stirring, adding HDI curing agent and TDI curing agent, and stirring to obtain the final product.
5. The method of preparing a intercoat coating for a wet-on-wet coating process according to claim 4, wherein the preparation method of the A-component comprises the steps of:
step (1): sequentially adding hydroxyl acrylic resin MACRYNAL SM 2704/75BACX, hyperbranched polyester resin, PMA, BAC, toluene, a dispersing agent, superfine silica powder, superfine talcum powder, superfine barium sulfate, titanium dioxide, modified bentonite, fumed silica and carbon black according to the formula amount, pre-dispersing at 900-1200 revolutions/min, grinding by using a horizontal sand mill until the fineness is below 15um, and controlling the flow rate of powder in the horizontal sand mill to be 10-15L/min at the temperature of below 50 ℃ to obtain slurry;
step (2): adding the leveling agent in the formula amount in the step (1), and stirring for 5-10min at 300-600 r/min;
and (3): adding the drier in the formula amount in the step (2), and stirring for 5-10min at 300-600 r/min;
and (4): adding the silane coupling agent with the formula amount in the step (3), and stirring at 300-600 r/min for 5-10min to obtain the silane coupling agent; the preparation method of the component B comprises the following steps: mixing BAC, xylene and dehydrating agent, stirring at 300-600 rpm for 5min, adding HDI curing agent and TDI curing agent, and stirring at 300-600 rpm for 15 min.
6. Use of a floating coat according to any of claims 1~3 in the preparation of a vehicle coating.
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| CN116478603A (en) * | 2023-04-06 | 2023-07-25 | 君子兰涂料（天津）有限公司 | Transparent skin paint with high scratch resistance and stain resistance and preparation method thereof |
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| US20010036999A1 (en) * | 2000-02-08 | 2001-11-01 | Yokoyama Thomas W. | Low VOC, coating compositions having improved flexibility and impact resistance based upon nonlinear, low-molecular weight polyester polyol resins |
| CN101469248B (en) * | 2007-12-30 | 2012-01-25 | 比亚迪股份有限公司 | Bicomponent polyurethane coating and preparation thereof |
| CN104559727A (en) * | 2014-12-08 | 2015-04-29 | 澳达树熊涂料(惠州)有限公司 | Double-component polyurethane white glass finishing varnish and preparation method thereof |
| CN108864912A (en) * | 2018-07-09 | 2018-11-23 | 雅图高新材料有限公司 | Low VOC bus floating coating of a kind of solvent type and preparation method thereof |
| CN109294433B (en) * | 2018-09-26 | 2020-12-01 | 雅图高新材料股份有限公司 | Low-VOC (volatile organic compound) automobile varnish and preparation method thereof |
| CN109535977B (en) * | 2018-11-28 | 2021-07-16 | 立邦涂料（中国）有限公司 | High-solid-content multifunctional quick-drying type floating coat composition and application thereof |
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