CN115820050B - Low-paint-mist conductive primer, preparation method and application thereof, and plastic product - Google Patents
Low-paint-mist conductive primer, preparation method and application thereof, and plastic product Download PDFInfo
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Abstract
The application relates to a low-paint-mist conductive primer, a preparation method and application thereof, and a plastic product, wherein the low-paint-mist conductive primer comprises the following components in parts by weight: 8 to 20 parts of first chlorinated polyolefin resin, 5 to 18 parts of second chlorinated polyolefin resin, 1.5 to 10 parts of polyester resin, 1.5 to 10 parts of alkyd resin, 0.1 to 1 part of isocyanate resin, 5 to 10 parts of titanium dioxide, 4.5 to 5.5 parts of conductive carbon black, 1 to 5.5 parts of auxiliary agent and 37 to 75 parts of solvent; the first chlorinated polyolefin resin has a weight average molecular weight of less than 10 ten thousand, the second chlorinated polyolefin resin has a weight average molecular weight of more than 15 ten thousand, and the ratio of the sum of the masses of the first chlorinated polyolefin resin and the second chlorinated polyolefin resin to the mass of the conductive carbon black is 1 (0.15 to 0.22). The low-paint mist conductive primer has higher storage stability; the adhesive force is better when the paint is sprayed to a plastic substrate, the paint mist quantity is less, and the film coating efficiency is higher.
Description
Technical Field
The application relates to the field of materials, in particular to a low-paint-mist conductive primer, a preparation method and application thereof and a plastic product.
Background
With the development of the automobile industry, plastics are widely used in the field of automobile parts such as bumpers, spoilers, rearview mirrors, center control panels, door trim and the like. For automobile parts with plastic base materials, an electrostatic spraying method is often adopted for spraying, the adhesive force and the storage stability of traditional paint adopting the electrostatic spraying method are better, but the paint mist quantity is larger during spraying, so that the coating efficiency is lower, the pollution to a coating line body is easy to cause, the later maintenance difficulty is increased, and the one-time yield of products is influenced.
Therefore, the low-paint mist conductive primer with better adhesive force and storage stability and higher coating efficiency has important significance.
Disclosure of Invention
Based on the paint, the application provides the low-paint mist conductive primer with better adhesive force and storage stability and higher coating efficiency, and the preparation method and application thereof, and the plastic product.
The technical scheme for solving the technical problems is as follows.
The low-paint mist conductive primer comprises the following components in parts by mass:
the weight average molecular weight of the first chlorinated polyolefin resin is less than 10 ten thousand, the weight average molecular weight of the second chlorinated polyolefin resin is more than 15 ten thousand, and the ratio of the sum of the masses of the first chlorinated polyolefin resin and the second chlorinated polyolefin resin to the mass of the conductive carbon black is 1 (0.15-0.22).
In some embodiments, the low-paint mist conductive primer comprises the following components in parts by mass:
in some of these embodiments, the ratio of the sum of the mass of the first chlorinated polyolefin resin and the second chlorinated polyolefin resin to the mass of the conductive carbon black in the low-paint mist conductive primer is 1 (0.16 to 0.21).
In some of these embodiments, the first chlorinated polyolefin resin and the second chlorinated polyolefin resin are both maleic anhydride modified chlorinated polyolefin resins in the low-paint mist conductive primer.
In some of these embodiments, the solvent comprises cyclohexane, aliphatic ester solvents, and aromatic solvents in the low-mist conductive primer.
In some embodiments, the low-paint mist conductive primer, the aliphatic ester solvent is selected from at least one of ethyl acetate, propyl acetate and butyl acetate, and the aromatic solvent is selected from at least one of xylene and trimethylbenzene.
In some of these embodiments, the auxiliary agent is selected from at least one of an anti-settling agent and a leveling agent in the low-paint mist conductive primer.
In some embodiments, the anti-settling agent is a higher fatty acid amide anti-settling agent in the low-mist conductive primer.
In some embodiments, the leveling agent is an organosilicon leveling agent in the low-paint mist conductive primer.
The application provides a preparation method of a low-paint mist conductive primer, which comprises the following steps:
providing raw materials according to the components of the low-paint mist conductive primer;
mixing the first chlorinated polyolefin resin, titanium pigment, conductive carbon black and a solvent, and then sanding to obtain sanding slurry;
the sanding slurry is mixed with the remaining raw materials.
The application provides application of the low-paint mist conductive primer in preparation of plastic products.
The application provides a plastic product, which comprises a base material and a paint layer arranged on the base material, wherein the base material is polypropylene plastic, and the slurry for forming the paint layer comprises the low-paint-mist conductive primer.
Compared with the prior art, the low-paint mist conductive primer has the following beneficial effects:
the low-paint-mist conductive primer comprises a first chlorinated polyolefin resin, a second chlorinated polyolefin resin, a polyester resin, an alkyd resin, an isocyanate resin, titanium pigment, conductive carbon black, an auxiliary agent and a solvent, wherein the first chlorinated polyolefin resin and the second chlorinated polyolefin resin are used as adhesion promoters, so that the adhesion of the low-paint-mist conductive primer on a polypropylene substrate is effectively improved; the second chlorinated polyolefin resin with larger weight average molecular weight is matched with the first chlorinated polyolefin resin with smaller weight average molecular weight, so that the atomization difficulty of the low-paint-mist conductive primer is effectively increased, and the generation of paint mist is reduced; and controlling the addition amount of the conductive carbon black, so that the primer has conductive performance, and simultaneously, the periphery of the conductive carbon black can adsorb resin to form large particles in a microscopic state, thereby increasing the atomization difficulty, further reducing the generation of paint mist, and effectively improving the coating efficiency; the isocyanate resin can improve the crosslinking density of the primer resin, so that the durability of the coating film is improved; the polyester resin and the alkyd resin interact and are matched with other auxiliary agents, so that the dispersion performance of titanium pigment and conductive carbon black is effectively improved, and the storage stability of the low-paint-mist conductive primer is effectively improved. The components in the low-paint-mist conductive primer act according to a specific proportion, so that the low-paint-mist conductive primer has higher storage stability; the adhesive force is better when the paint is sprayed to a plastic substrate, the paint mist quantity is less, and the film coating efficiency is higher; and the performances of water resistance, wet heat resistance, 92# gasoline resistance, ethanol gasoline resistance and high-pressure water impact resistance are all qualified.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram showing the state of paint mist when the primer prepared in example 1 is sprayed;
FIG. 2 is a diagram showing the state of paint mist when the primer prepared in example 2 is sprayed;
FIG. 3 is a diagram showing the state of paint mist when the primer prepared in example 3 is sprayed;
FIG. 4 is a paint mist state diagram of the primer prepared in example 4 when sprayed;
FIG. 5 is a paint mist state diagram of the primer prepared in example 5 when sprayed;
FIG. 6 is a paint mist state diagram of the primer prepared in comparative example 1 when it is sprayed;
FIG. 7 is a view showing the state of paint mist when the primer prepared in comparative example 2 is sprayed;
fig. 8 is a view showing a state of paint mist when the primer prepared in the comparative example was sprayed.
Detailed Description
The technical scheme of the application is further described in detail below with reference to specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The weights of the relevant components mentioned in the description of the embodiments of the present application may refer not only to the specific contents of the components, but also to the proportional relationship between the weights of the components, so long as the contents of the relevant components in the description of the embodiments of the present application are scaled up or down within the scope of the disclosure of the embodiments of the present application. Specifically, the weight described in the specification of the embodiment of the present application may be mass units known in the chemical industry field such as μ g, mg, g, kg.
The application provides a low-paint mist conductive primer, which comprises the following components in parts by mass:
the first chlorinated polyolefin resin has a weight average molecular weight of less than 10 ten thousand, the second chlorinated polyolefin resin has a weight average molecular weight of more than 15 ten thousand, and the ratio of the sum of the masses of the first chlorinated polyolefin resin and the second chlorinated polyolefin resin to the mass of the conductive carbon black is 1 (0.15 to 0.22).
The first chlorinated polyolefin resin and the second chlorinated polyolefin resin are used as adhesion promoters, so that the adhesion of the low-paint mist conductive primer on the polypropylene base material is effectively improved; the second chlorinated polyolefin resin with larger weight average molecular weight is matched with the first chlorinated polyolefin resin with smaller weight average molecular weight, so that the atomization difficulty of the low-paint-mist conductive primer is effectively increased, and the generation of paint mist is reduced; and controlling the addition amount of the conductive carbon black, so that the primer has conductive performance, and simultaneously, the periphery of the conductive carbon black can adsorb resin to form large particles in a microscopic state, thereby further reducing the generation of paint mist, and effectively improving the coating efficiency; the isocyanate resin can improve the crosslinking density of the primer resin, so that the durability of the coating film is improved; the polyester resin and the alkyd resin interact and are matched with other auxiliary agents, so that the dispersion performance of titanium pigment and conductive carbon black is effectively improved, and the storage stability of the low-paint-mist conductive primer is effectively improved. The components in the low-paint-mist conductive primer act according to a specific proportion, so that the prepared low-paint-mist conductive primer has higher storage stability; the adhesive force is better when the paint is sprayed to a plastic substrate, the paint mist quantity is less, and the film coating efficiency is higher; and the performances of water resistance, wet heat resistance, 92# gasoline resistance, ethanol gasoline resistance and high-pressure water impact resistance are all qualified.
The low-paint-mist conductive primer has less paint mist quantity, so that the utilization rate of the paint can be improved, and the cost of the paint can be saved; the cleanliness of the coating line body can be improved due to the small amount of paint mist, so that the line body is easier to maintain, and the one-time yield of products after being taken off line is improved.
It is understood that the parts of the first chlorinated polyolefin resin include, but are not limited to, 8 parts, 8.5 parts, 10 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 17.5 parts, 18 parts, 19 parts, 20 parts; parts of the second chlorinated polyolefin resin include, but are not limited to, 5 parts, 8 parts, 8.5 parts, 9 parts, 10 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts; parts of polyester resin include, but are not limited to, 1.5 parts, 2 parts, 3 parts, 4 parts, 5 parts, 8 parts, 8.5 parts, 9 parts, 10 parts; parts of alkyd resin include, but are not limited to, 1.5 parts, 2 parts, 3 parts, 4 parts, 5 parts, 8 parts, 8.5 parts, 9 parts, 10 parts; parts of isocyanate resins include, but are not limited to, 0.1 part, 0.2 part, 0.3 part, 0.5 part, 0.7 part, 0.8 part, 1 part; the parts of titanium dioxide include, but are not limited to, 5 parts, 8 parts, 8.5 parts, 9 parts, 10 parts; parts of conductive carbon black include, but are not limited to, 4.5 parts, 4.6 parts, 4.8 parts, 4.9 parts, 5 parts, 5.2 parts, 5.3 parts, 5.5 parts, parts; parts of auxiliary agents include, but are not limited to, 1 part, 1.5 parts, 2 parts, 3 parts, 4 parts, 5 parts, 5.5 parts; solvents include, but are not limited to, 37 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts.
In some examples, the low-paint mist conductive primer comprises the following components in parts by mass:
it is understood that the ratio of the sum of the mass of the first chlorinated polyolefin resin and the second chlorinated polyolefin resin to the mass of the conductive carbon black includes, but is not limited to, 1:0.15, 1:0.16, 1:0.17, 1:0.18, 1:0.19, 1:0.20, 1:0.21, 1:0.22.
In some examples, the ratio of the sum of the mass of the first chlorinated polyolefin resin and the second chlorinated polyolefin resin to the mass of the conductive carbon black in the low-paint mist conductive primer is 1 (0.16 to 0.21).
In some of these examples, the first chlorinated polyolefin resin is a maleic anhydride modified chlorinated polyolefin resin in the low-paint mist conductive primer.
Alternatively, the first chlorinated polyolefin resin is 20% CPO115.
It is understood that the first chlorinated polyolefin resin manufacturing company of type 20% CPO115 may be Hunan Xiangjiang Guangxi coatings Co., ltd.
Further, 20% cpo115 comprises the following components in parts by mass:
CY-9122P 20 parts,
53.33 parts of toluene
26.67 parts of xylene.
Further, CY-9122P is a maleic anhydride-modified chlorinated polyolefin resin spun by Toyo Japan.
In some of these examples, the second chlorinated polyolefin resin is a maleic anhydride modified chlorinated polyolefin resin in the low-paint mist conductive primer.
Alternatively, the second chlorinated polyolefin resin is of the type 13-MLJ in Toyo-spinning, japan.
It is understood that the first chlorinated polyolefin resin of 20% CPO115, inc. of Henan Hunan Xiangjiang Guangxi coating, has a weight average molecular weight of less than 10 ten thousand and a weight average molecular weight of more than 15 ten thousand in Japan Toyo-in 13-MLJ.
In some of these examples, the alkyd resin is Colophonium CP-1016AD in a low-paint mist conductive primer.
In some of these examples, the low-mist conductive primer is a blocked isocyanate resin.
Further, the isocyanate resin was Japanese Guangxi ZU-037.
In some examples, the low-mist conductive primer is a rutile titanium dioxide.
Further, the titanium white powder is Japanese stone original TIPAQUE CR-93 titanium white powder.
In some examples, the conductive carbon black in the low-mist conductive primer is Cabot VXC72, cabot, usa.
In some of these examples, the low-mist conductive primer is a polyester resin formed by polycondensation of a polyacid and a polyol.
It is understood that polyacids include, but are not limited to, isophthalic acid, hydrophthalic anhydride, 1, 4-cyclohexane-2-carboxylic acid, phthalic acid, tetrahydrophthalic anhydride, adipic acid; polyols include, but are not limited to, neopentyl glycol, trimethylol propane, 2-butyl-2-ethyl-1, 3-propanediol, hexylene glycol, and dry oils.
In some examples, the low-mist conductive primer includes a solvent including cyclohexane, an aliphatic ester solvent, and an aromatic solvent.
It will be appreciated that the aliphatic ester solvent may be a low carbonic acid ester; further, esters of low carbonic acid include, but are not limited to, monohydric alcohol esters, dihydric alcohol ether esters of acetic acid, propionic acid, butyric acid and lactic acid esters, and dibasic acid esters; aromatic solvents include mono-and polycyclic aromatic hydrocarbons; further, the monophenyl arene includes, but is not limited to, benzene, toluene, xylene, and trimethylbenzene.
In some examples, the low-spray conductive primer includes an aliphatic ester solvent selected from at least one of ethyl acetate, propyl acetate, and butyl acetate.
Alternatively, the aliphatic ester is selected from butyl acetate.
In some examples, the low-spray conductive primer includes an aromatic solvent selected from at least one of xylene and trimethylbenzene.
Further, the aromatic solvent includes a first aromatic solvent and a second aromatic solvent, the first aromatic solvent is xylene, and the second aromatic solvent is trimethylbenzene.
It is understood that adjuvants include, but are not limited to, anti-settling agents, leveling agents, defoamers, surfactants, and dispersants.
In some examples, the auxiliary agent is selected from at least one of an anti-settling agent and a leveling agent in the low-mist conductive primer.
Further, the anti-settling agent is a higher fatty acid amide anti-settling agent.
In some specific examples, the anti-settling agent in the low-mist conductive primer is SP-1000 manufactured by Kyowa Co., ltd.
In some of these examples, the leveling agent is an organosilicon-based leveling agent in the low-paint mist conductive primer.
In some specific examples, the leveling agent is phyllotonic LS-009 in the low paint mist conductive primer.
The application provides a preparation method of a low-paint mist conductive primer, which comprises the following steps of S10-S30:
step S10: the raw materials are provided according to the components of the low-paint mist conductive primer.
Step S20: and mixing the first chlorinated polyolefin resin, titanium pigment, conductive carbon black and a solvent, and then sanding to obtain sanding slurry.
In some examples, the solvent added in step S20 includes an aliphatic ester solvent and a first aromatic solvent.
In some examples, in step S20, the step of adding a polyester resin and an alkyd resin is further included before the step of sanding.
It will be appreciated that the polyacid resin and alkyd resin may be added in their entirety or may be added in part, with the remainder being added in step S30.
In some examples, in step S20, a step of adding an auxiliary agent is further included before the sanding step. Further, an anti-settling agent is added.
In some specific examples thereof, step S20 includes the steps of:
under the stirring state, respectively adding the aliphatic ester solvent, the first aromatic solvent, the first chlorinated polyolefin resin, the polyester resin and the alkyd resin into a container, stirring for 5-10min, adding the anti-settling agent, continuously stirring for 10-20min, adding the titanium white, continuously stirring for 20-30min, adding the conductive carbon black, and stirring for 30-40 min.
In some examples, in step S20, the material temperature is controlled below 50 ℃.
In some of these examples, in step S20, sanding is performed using a red-head sander.
Further, the dispersion medium for sanding is glass beads.
It will be appreciated that, after the sanding step, step S21 is further included: and cleaning the sand mill by adopting a solvent.
Further, the sand mill is washed with a first aromatic solvent.
Step S30: the sanding slurry is mixed with the remaining raw materials.
It will be understood that in step S30, the remaining raw materials are raw materials that were not added in step S20 to the raw materials provided in step S10.
In some specific examples thereof, step S30 includes the steps of:
in the stirring state, isocyanate resin, second chlorinated polyolefin resin, second aromatic solvent, cyclohexane, leveling agent and the rest of first aromatic solvent, polyester resin and alkyd resin are respectively added into the sanding slurry.
It can be understood that in step S30, a part of the first aromatic solvent may be added, and after being stirred uniformly, step S31 is performed: the solid content and viscosity of the mixed solution are adjusted by adopting the first aromatic solvent.
In some specific examples, in the preparation method of the low-paint mist conductive primer, the components and parts added in each step are shown in table 1:
TABLE 1
| S20 | Aliphatic ester solvent | 5-10 parts |
| S20 | First aromatic solvent | 20-30 parts |
| S20 | First chlorinated polyolefin resin | 8-20 parts |
| S20 | Polyester resin | 0 to 5 parts of |
| S20 | Alkyd resins | 0 to 5 parts of |
| S20 | Anti-settling agent | 1 to 5 parts of |
| S20 | Titanium white powder | 5-10 parts |
| S20 | Conductive carbon black | 4.5 to 5.5 parts |
| S21 | First aromatic solvent | 1 to 5 parts of |
| S30 | Polyester resin | 1.5 to 5 parts |
| S30 | Alkyd resins | 1.5 to 5 parts |
| S30 | Second chlorinated polyolefin resin | 5-18 parts |
| S30 | Isocyanate resin | 0.1 to 1 part |
| S30 | First aromatic solvent | 5-10 parts |
| S30 | Second aromatic solvent | 1 to 5 parts of |
| S30 | Cyclohexane | 5-10 parts |
| S30 | Leveling agent | 0.05 to 0.5 part |
| S31 | First aromatic solvent | 1 to 5 parts of |
The embodiment of the application provides application of the low-paint mist conductive primer in preparation of plastic products. The application further provides a plastic product, which comprises a substrate and a paint layer arranged on the substrate, wherein the substrate is made of polypropylene plastic, and the paint layer forming slurry comprises the low-paint-mist conductive primer.
When the low-paint-mist conductive primer is sprayed on a polypropylene plastic substrate by adopting an automaton, the adhesive force is better, the paint mist quantity is less, and the coating efficiency is higher; and the plastic product has qualified water resistance, damp heat resistance, 92# gasoline resistance, ethanol gasoline resistance and high-pressure water impact resistance.
In some embodiments, the paint layer of the plastic article may be the low-mist conductive primer described above, i.e., sprayed directly onto the substrate using the low-mist conductive primer described above. In other embodiments, the paint layer of the plastic article may include other pastes in addition to the low-mist conductive primer described above.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The following examples of the low-paint mist conductive primer, the preparation method and the application thereof, and the plastic product according to the present application, it is to be understood that the low-paint mist conductive primer, the preparation method and the application thereof, and the plastic product according to the present application are not limited to the following examples.
The sources of the components used in the following examples and comparative examples are as follows:
the paint comprises a first chlorinated polyolefin resin (20% CPO115 of Hunan Xiangjiang Guangxi paint Co., ltd., weight average molecular weight is less than 10 ten thousand), a second chlorinated polyolefin resin (13-MLJ of Toyo-yo, weight average molecular weight is more than 15 ten thousand), alkyd resin (Korshina CP-1016 AD), isocyanate resin (Japanese Guanzu-037), rutile titanium dioxide (Japanese titanium white powder TIPAQUE CR-93), conductive carbon black (Kabot Cabot VXC72 of U.S.), an anti-settling agent (SP-1000 of Japanese co-Rong Co., ltd.), and a leveling agent (Nanoz conversion into LS-009).
The polyester resins used in the following examples and comparative examples were prepared as follows:
5.72 parts of neopentyl glycol, 8.07 parts of trimethylolpropane, 24.02 parts of 2-butyl-2-ethyl-1, 3-propanediol, 18.18 parts of isophthalic acid, 6.97 parts of phthalic anhydride, 1, 4-cyclohexane-2-carboxylic acid and 2.69 parts of dimethylbenzene are added into a four-neck flask provided with a stirrer, a thermometer, a condenser, a water separator and a nitrogen introducing device, the temperature is raised to 160 ℃ for reflux dehydration, 3.6 ℃ to 230+/-5 ℃ every 10 minutes, when the reflux reaction is carried out until the acid value reaches 4.0+/-0.5, 0.71 part of phthalic acid is added, the reflux dehydration is carried out until the acid value reaches 7.0-9.0 at 160+/-5 ℃, the weight average molecular weight reaches 3632, the viscosity of a Gauss tube reaches XY-Z1Z2, and then 11.71 parts of dimethylbenzene and 17.65 parts of trimethylbenzene are diluted to 70% (mass percent) for solid part for standby.
Example 1
(1) Under the stirring state, 6.8 parts of aliphatic ester solvent (butyl acetate), 25.6 parts of first aromatic solvent (dimethylbenzene), 17.5 parts of first chlorinated polyolefin resin (20% CPO115 of Hunan Xiangjiang Guangxi paint Co., ltd.), 1.4 parts of polyester resin and 1.8 parts of alkyd resin (Korsche CP-1016 AD) are sequentially added into a container device, stirring is carried out for 5-10min to fully stir the resin uniformly, 1.5 parts of anti-settling agent (Japanese co-glong SP-1000) is added, stirring is carried out for 10-20min to uniformly disperse the anti-settling auxiliary agent, then high-speed titanium white pigment is added for 20-30min to fully wet the titanium white pigment, finally, the stirring speed is reduced, the stirring speed is gradually increased after 4.5 parts of conductive carbon black (Kaposi Cabot VVC 72) is added, the high-speed stirring is maintained for 30-40min, and the material temperature is controlled to be below 50 ℃ to obtain pre-slurry; wherein the ratio of the sum of the masses of the first chlorinated polyolefin resin and the second chlorinated polyolefin resin to the mass of the conductive carbon black is 1:0.17;
(2) Taking glass beads as a dispersion medium, adopting a red head sand mill to sand and disperse the front slurry, and enabling the fineness of the front slurry to meet the requirement after sand milling for one time; after the sand grinding is finished, 2.65 parts of a first aromatic solvent is used for cleaning a sand mill, and the discharged materials need to be collected to obtain sand grinding slurry;
(3) The sanding slurry is stirred uniformly, 1.7 parts of polyester resin, 1.8 parts of alkyd resin, 9 parts of second chlorinated polyolefin resin (Japanese eastern textile 13-MLJ, the weight average molecular weight is more than 15 ten thousand) and 0.63 part of blocked isocyanate resin (Japanese Guangxi ZU-037), 6.7 parts of first aromatic solvent, 4.3 parts of second aromatic solvent (trimethylbenzene), 6.5 parts of cyclohexane and 0.1 part of leveling agent (phyllostane LS-009) are gradually added under the stirring state to carry out a blending procedure, so that the coating liquid is in a relatively stable state, and finally 1.5 parts of first aromatic solvent is used for adjusting the mass, the solid content and the viscosity of the coating liquid.
Example 2
Substantially the same as in example 1, except that in step (1), the addition amount of the conductive carbon black was increased to 5.5 parts; wherein the ratio of the sum of the masses of the first chlorinated polyolefin resin and the second chlorinated polyolefin resin to the mass of the conductive carbon black is 1:0.21.
Example 3
Substantially the same as in example 1, except that in step (1), the alkyd resin was omitted and the amount of the polyester resin added was increased to 3.2 parts.
Example 4
Substantially the same as in example 1, except that in step (1), the polyester resin was omitted and the amount of alkyd resin added was increased to 3.2 parts.
Example 5
Substantially the same as in example 1, except that in step (1), the first chlorinated polyolefin resin was added in an amount of 8.5 parts; in the step (3), the addition amount of the second chlorinated polyolefin resin is increased to 18 parts.
Comparative example 1
Substantially the same as in example 1, except that the first chlorinated polyolefin resin was added in an amount of 26.5 parts in step (1), and the second chlorinated polyolefin resin was omitted in step (3); meanwhile, the part of the conductive carbon black is 3.5 parts.
Comparative example 2
Substantially the same as in example 1, except that in step (1), the addition amount of the conductive carbon black was increased to 6.5 parts; wherein the ratio of the sum of the masses of the first chlorinated polyolefin resin and the second chlorinated polyolefin resin to the mass of the conductive carbon black is 1:0.25.
Comparative example 3
Substantially the same as in example 1, except that the alkyd resin in step (1) and step (2) was omitted, the amount of the polyester resin added in step (1) was increased to 3.2 parts, and the amount of the polyester resin added in step (2) was increased to 3.5 parts.
Comparative example 4
Substantially the same as in example 1, except that the alkyd resin in example 1 was replaced with an equal mass part of epoxy resin (New Japanese iron gold EPO TOHTO YH-300).
Comparative example 5
Substantially the same as in example 1, the first chlorinated polyolefin resin was omitted, and the second chlorinated polyolefin resin was 26.5 parts.
Comparative example
6 parts of thermoplastic acrylic resin (De-modus resin AC-7435), 8 parts of polyester resin, 0.8 part of epoxy resin (Wu-tin Di-Eggshell 850S), 50 parts of mixed solvent (containing 25 parts of toluene, 10 parts of xylene and 15 parts of methyl isobutyl ketone), 0.42 part of pigment dispersing agent (0.12 part of Pick chemical Disperbyk 161, 0.24 part of Lubo SOLSPERSE hyperdispersing agent 32500, 0.06 part of Lubo SOLSPERSE hyperdispersing agent 5000), 5 parts of titanium pigment, 1 part of conductive carbon black, 1 part of fumed silica (Gao Sha-Heroule 972), 15 parts of polyurethane modified chlorinated polyolefin resin, 0.001 part of flatting agent (Japanese nanben into OX-70), 0.01 part of antifoaming agent (Jiangsu Huaren S-100A) and 13 parts of high-boiling aromatic hydrocarbon solvent.
The components and parts of each of the examples and comparative examples are shown in Table 2.
TABLE 2
Wherein, A in comparative example 4 is epoxy resin (New Japanese iron gold EPO TOHTO YH-300).
The primers prepared in each example, comparative example and comparative example were subjected to a film-coating efficiency test, and the test procedure was as follows:
(1) 6 PP plates with the size of 150 x 100 x 3mm are taken for each primer, each PP plate is weighed by an analytical balance and recorded as M 0 ；
(2) 6 PP plates are stuck on the tin plate with 300 mm by using a yellow adhesive tape, so that no sundries are left on the front surface of the PP plate;
(3) Spraying primer by adopting the same parameters of a six-floor oil reciprocating machine of Hunan Xiangjiang Guangxi coating Co, leveling for 7min after spraying, and baking by using an KEEP (KEEP) at 80 ℃ for 30 min;
(4) The PP test plate is weighed to be M after being cooled 1 The dry film weight on the primer is: m is M 1 -M 0 ；
(5) Assuming that the volume of each primer sprayed according to fixed parameters is V, the weight of the solid paint consumed by spraying is: v ρ Construction method *NV Construction method ；
(6) Film coating efficiency calculation: (M) 1 -M 0 )/(V*ρ Construction method *NV Construction method )；
(7) And (3) calculating the comparative film efficiency: taking the film coating efficiency of the primer prepared in the comparative example as a reference, the film coating efficiency is assumed to be 1; the relative film efficiencies of the primers prepared in each example and comparative example were: the results of the film-coating efficiency of the primers prepared in each example and comparative example/the film-coating efficiency of the primer prepared in comparative example are shown in Table 3.
TABLE 3 Table 3
Paint mist state evaluation was performed on the primers prepared in each example, comparative example and comparative example:
the salt pan WIDER 1 manual air spray gun is adopted, and the compressed air is adjusted to 4.0kg/cm 2 The spray coating was performed by opening the needle 3 circles, and the paint mist state diagrams of examples 1 to 5, comparative examples 1 to 2 and comparative examples at the time of the bottom spray coating are shown in fig. 1 to 8, respectively.
As can be seen from fig. 1 to 8, the primer compositions of examples 1 to 5 have a smaller amount of paint mist than the primer compositions of comparative examples and comparative example 1.
The primers prepared in each example, comparative example and comparative example were subjected to performance test as follows:
the method comprises the steps of taking a bumper PP flat plate (Shanghai gold development technology ABP 1010), wiping cleanly by isopropanol, spraying the primers (film thickness is 8 mu m) prepared in the examples, the comparative examples and the comparative examples on the flat plate respectively, flashing for 5-10min, then spraying a single-component base paint (film thickness is 18 mu m, LS-20 paint of Hunan Xiangjiang Guangxi paint Co., ltd.) for 5-10min, then spraying a double-component finishing varnish (film thickness is 30 mu m, HA1520 varnish of Hunan Xiangjiang Guangxi paint Co., ltd.) for leveling for 7-10min, baking at 80 ℃ for 30min, and testing the performance of the composite coating after standing for 7 days at room temperature, wherein the test standard is as follows:
adhesion force: GB/T9286-2021, the requirement is less than or equal to 1 grade; water-resistant (40 ℃ x 240 h): GB T1733-1993 requires no significant change in sample surface; heat and humidity resistance (50 ℃ x 240 h): GB T13893-2008 requires no obvious change on the surface of the sample; high pressure water impact resistance: long safety automobile-MTS-F03-03-002-B3-2019 (exterior plastic coating requirement Specification), high pressure water impact resistant method B, and required falling area less than or equal to 2mm 2 The method comprises the steps of carrying out a first treatment on the surface of the 92# gasoline (20 ℃ x 4h soak): GB/T1734-1993 requires no significant change in sample surface; ethanol-resistant gasoline (ethanol 92# gasoline=10/90) (20 ℃ x 0.5h soak): honda automobile, bumper coating quality Specification, needs to beSolving that the surface of the sample has no obvious change; storing for 6 months at normal temperature: GB/T6753.3-1986 requires no obvious change in the coating; the results are shown in Table 4:
TABLE 4 Table 4
As can be seen from Table 4, the primer prepared in the examples showed eligibility in terms of adhesion, water resistance, heat and humidity resistance, high pressure water impact resistance, 92# gasoline resistance, ethanol gasoline resistance, and normal temperature storage; whereas the conventional primer control showed failure in the ethanol-resistant gasoline (ethanol 92# gasoline=10/90) test; and comparative example 1, substantially identical to example 1, except that the second chlorinated polyolefin resin was omitted while increasing the fraction of the first chlorinated polyolefin resin, the fraction of the conductive carbon black had been reduced, and the resulting primer showed failure in the ethanol-resistant gasoline (ethanol 92# gasoline=10/90) test; comparative example 2, which is substantially the same as example 1 except that the number of conductive carbon black is increased, the resulting primer exhibits a thickening condition when stored at normal temperature for 6 months; comparative example 3, which is substantially the same as example 1, except that alkyd resin is omitted while increasing the fraction of polyester resin, the resulting primer exhibited unacceptable panel bubbling in the wet heat resistance test; comparative example 4, which is substantially the same as example 1, except that the alkyd resin is replaced with an equal amount of epoxy resin, the resulting primer exhibits a tackifying condition upon storage at room temperature for 6 months; comparative example 5 was substantially the same as in example 1 except that the first chlorinated polyolefin resin was omitted while increasing the part of the second chlorinated polyolefin resin, and the primer produced showed a thickening condition at room temperature for 6 months.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which facilitate a specific and detailed understanding of the technical solutions of the present application, but are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. It should be understood that, based on the technical solutions provided by the present application, those skilled in the art may obtain technical solutions through logical analysis, reasoning or limited experiments, which are all within the scope of protection of the appended claims. The scope of the patent is therefore intended to be covered by the appended claims, and the description and drawings may be interpreted as illustrative of the contents of the claims.
Claims (11)
1. The low-paint mist conductive primer is characterized by comprising the following components in parts by weight:
the weight average molecular weight of the first chlorinated polyolefin resin is less than 10 ten thousand, the weight average molecular weight of the second chlorinated polyolefin resin is more than 15 ten thousand, and the ratio of the sum of the masses of the first chlorinated polyolefin resin and the second chlorinated polyolefin resin to the mass of the conductive carbon black is 1 (0.16-0.21).
2. The low paint mist conductive primer as claimed in claim 1, which comprises the following components in parts by mass:
3. the low paint mist conductive primer of claim 1 wherein the first chlorinated polyolefin resin and the second chlorinated polyolefin resin are both maleic anhydride modified chlorinated polyolefin resins.
4. The low-spray conductive primer according to claim 1, wherein the solvent comprises cyclohexane, an aliphatic ester solvent, and an aromatic solvent.
5. The low paint mist conductive primer of claim 4 wherein the aliphatic ester solvent is selected from at least one of ethyl acetate, propyl acetate and butyl acetate and the aromatic solvent is selected from at least one of xylene and trimethylbenzene.
6. The low-paint mist conductive primer of claim 1, wherein the auxiliary agent is selected from at least one of an anti-settling agent and a leveling agent.
7. The low-spray conductive primer of claim 6, wherein the anti-settling agent is a higher fatty acid amide anti-settling agent.
8. The low-paint mist conductive primer of claim 6, wherein the leveling agent is an organosilicon leveling agent.
9. The preparation method of the low-paint mist conductive primer is characterized by comprising the following steps of:
providing raw materials according to the components of the low paint mist conductive primer according to any one of claims 1 to 8;
mixing the first chlorinated polyolefin resin, titanium pigment, conductive carbon black and a solvent, and then sanding to obtain sanding slurry;
the sanding slurry is mixed with the remaining raw materials.
10. Use of a low-paint mist conductive primer as claimed in any one of claims 1 to 8 in the preparation of a plastic article.
11. A plastic article comprising a substrate and a paint layer disposed on the substrate, wherein the substrate is a polypropylene plastic and the paint layer forming slurry comprises the low-paint mist conductive primer of any one of claims 1 to 8.
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