CN115710445B - Water-based low-temperature-resistant protective coating as well as preparation method and application thereof - Google Patents
Water-based low-temperature-resistant protective coating as well as preparation method and application thereof Download PDFInfo
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- CN115710445B CN115710445B CN202211531401.0A CN202211531401A CN115710445B CN 115710445 B CN115710445 B CN 115710445B CN 202211531401 A CN202211531401 A CN 202211531401A CN 115710445 B CN115710445 B CN 115710445B
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Abstract
The application discloses a water-based low-temperature-resistant protective coating, which consists of the following components: 20-30% of acrylic emulsion A, 20-30% of acrylic emulsion B, 0.2-0.8% of defoamer, 0.2-0.8% of multifunctional auxiliary AMP-95, 0.2-0.8% of preservative, 1-2% of film forming auxiliary, 1-2% of flame retardant, 30-40% of functional filler, 8-10% of black water-based paint slag composite powder, and the balance of water in percentage by weight. The black water paint slag composite powder is a composite solid powder material prepared by taking paint slag as a raw material. The application of the water-based low-temperature-resistant protective coating in serving as or preparing an automobile chassis protective coating. The water-based low-temperature-resistant protective coating provided by the application can be used for forming a cured coating which can resist the low temperature of minus 40 ℃, is free from cracking and foaming, has good adhesive force and has excellent surface drying speed.
Description
Technical Field
The application relates to a water-based low-temperature-resistant protective coating, a preparation method thereof and application thereof in serving as or preparing an automobile chassis protective coating, and belongs to the technical field of coatings.
Background
The coating is a material which can be coated on the surface of an object by different construction processes to form a solid film which is firmly adhered, has certain strength and is continuous. The films so formed are known as paint films, also known as paint films or coatings. The paint belongs to organic chemical polymer material, and the formed film belongs to polymer compound type. According to the classification of modern chemical products, the coating belongs to fine chemical products. Modern coatings are becoming a kind of multifunctional engineering materials gradually, and are an important industry in the chemical industry.
The chassis of the automobile consists of a drive system, a running system, a steering system and a braking system. The chassis is used for supporting and installing the automobile engine and various parts and assemblies thereof, forming the integral shape of the automobile and receiving the power of the engine so as to enable the automobile to move and ensure normal running. Is particularly important for protecting the chassis of the automobile. The protective coating for the automobile chassis in the prior art can crack and separate from the plate after 4 hours at the temperature of-10 ℃, so that the product sales mainly takes the region with higher temperature in the south in winter as the main part, and therefore, the protective coating has a larger progress space in the aspect of low temperature resistance.
Waste paint slag is a residue produced in the industry coating industry or a hazardous waste solid slag produced by peeling of paint coated. Paint slag belongs to HW12 dangerous wastes defined in the national dangerous waste directory, and is managed and disposed according to the dangerous wastes. The country clearly prescribes enterprises or individuals of units generating the wastes, the types, the quantity and the directions of the dangerous wastes are declared according to the requirements, and meanwhile, effective measures such as seepage prevention, leakage prevention and the like are needed to be adopted for temporary storage and are delivered to the units with dangerous waste management licenses for centralized harmless treatment.
The paint slag component generally takes alkyd resin, acrylic resin, chlorinated rubber resin, epoxy resin and the like as matrixes, and contains more water by adding dyes such as titanium dioxide, chrome yellow and the like. The applicant of the present application has been working on recycling waste paint residues, and filed a plurality of patent applications, such as CN 110872433A, which discloses a waterproof coiled material prepared from paint residues and a preparation method thereof, and CN 110804263A discloses a PVC building template prepared from paint residues and a preparation method thereof. At present, reports on the aspect of preparing low-temperature-resistant protective paint from paint slag are not yet seen.
Disclosure of Invention
Aiming at the prior art, the application provides a water-based low-temperature-resistant protective coating, a preparation method thereof and application thereof in serving as or preparing an automobile chassis protective coating. The water-based low-temperature-resistant protective coating disclosed by the application takes powder prepared from waste paint slag as a raw material, has excellent low-temperature resistance, corrosion resistance and stone chip resistance, and has high adhesive force with a metal plate.
The application is realized by the following technical scheme:
an aqueous low-temperature-resistant protective coating comprises the following components: 20-30% of acrylic emulsion A, 20-30% of acrylic emulsion B, 0.2-0.8% of defoamer, 0.2-0.8% of multifunctional auxiliary AMP-95, 0.2-0.8% of preservative, 1-2% of film forming auxiliary, 1-2% of flame retardant, 30-40% of functional filler, 8-10% of black water-based paint slag composite powder, and the balance of deionized water (3-8%) in percentage by weight;
the acrylic emulsion A is aqueous self-crosslinking elastic emulsion (formed by copolymerization of acrylic ester and functional monomer) with molecular weight of 20-30 ten thousand and viscosity of less than 1000 cps;
the acrylic emulsion B is an aqueous acrylic emulsion (environment-friendly) with the molecular weight of 1-2 ten thousand and the viscosity of 2000-3000 cps.
The black water-based paint slag composite powder is prepared by collecting flocculated paint slag sprayed by water-based/oil-based paint produced by acrylic resin, sorting and secondarily flocculating and cleaning, drying and dehydrating the cleaned paint slag, crushing to prepare 400-mesh composite solid powder material, which is a product existing in the prior art, and is described in an application patent CN107309253A (application name: a production process and a production line for preparing high-molecular resin composite solid powder from paint slag) owned by the applicant of the application, namely the high-molecular resin composite solid powder in the patent, wherein the preparation method is also described in the patent, namely the steps are as follows:
s1, classifying paint waste residues, and separating large paint residues from the paint waste residues; the large paint slag is blocky paint slag with the longest length of the external dimension of the large paint slag being more than or equal to 30 cm;
s2, uniformly distributing the paint waste residues with the large paint residues removed in the step S1 to a filter pressing system;
s3, carrying out filter pressing on the paint waste residues after the distribution in the S2; the waste water and the paint waste residue after draining are obtained after filter pressing;
s4, crushing the large paint slag classified in the S1 and the drained paint slag obtained in the S3;
s5, drying the paint waste residue after crushing in the step S4;
s6, carrying out superfine grinding on the paint waste residues after drying in the S5, and collecting the paint waste residues in a grading manner according to different fineness;
s7, packaging the materials obtained in the S6;
all the steps are carried out in a closed cover body, the waste water obtained in the step S2 is collected and treated, and the waste gas obtained in the steps S4 to 6 is collected and treated.
The acrylic emulsion A has good extensibility and durable toughness, and when the acrylic emulsion A is used for preparing elastic paint, the elasticity is good, a coating film is not easy to crack, and the acrylic emulsion A can bear the expansion caused by heat and contraction caused by cold of a foundation. Because of its good low temperature toughness, it is more suitable for application in northern areas.
The acrylic emulsion B is environment-friendly aqueous acrylic emulsion. It is nontoxic, odorless, safe and healthy; the paint has the advantages of high gloss, good leveling property, good water resistance, strong adhesive force, excellent weather resistance, outstanding gloss and color retention performance, excellent alcohol resistance stability, and colorless and transparent film formation; the modified acrylic acid modified acrylic resin has good compatibility with acrylic acid polymers and other aqueous resins popular in the market, and has good pigment wettability. The application adopts two different acrylic emulsions, firstly, the viscosity of the two emulsions is different, the viscosity of the acrylic emulsion A is generally less than 1000cps, the viscosity of the acrylic emulsion B is generally between 2000 and 3000cps, and the product with the viscosity suitable for atomization spraying is prepared by determining the matching proportion of the two emulsions. The second reason is that the polymerization degree of two acrylic emulsion is different, the molecular weight of the acrylic emulsion A is between 20 ten thousand and 30 ten thousand, the toughness after film forming is good, the strength is high, the acrylic emulsion B is not easy to crack, the molecular weight of the acrylic emulsion B is between 1 ten thousand and 2 ten thousand, the leveling property and the glossiness are good, the price is low, and the protective coating product with excellent performance and controllable cost is prepared by adjusting the proportion of the two emulsions.
The multifunctional auxiliary AMP-95 is one of a few industrial amines with low molecular weight and high alkalinity, and contains 5% of water-2-amino-2-methyl-1-propanol. Is a commodity existing in the prior art. Can be used as a multifunctional auxiliary agent of various emulsion paints, and can be used as a strong co-dispersing agent in the formula to prevent pigment from reagglomeration.
The functional filler is selected from calcium carbonate, preferably nano-sized activated calcium carbonate.
The flame retardant is selected from phosphorus-nitrogen flame retardants.
The defoamer, the preservative, the film forming auxiliary agent and the flame retardant are all conventional components in the prior art.
The preparation method of the water-based low-temperature-resistant protective coating comprises the following steps:
(1) Sequentially adding the acrylic emulsion A, the acrylic emulsion B, the defoaming agent, the multifunctional auxiliary agent, the preservative and the film-forming auxiliary agent into deionized water to prepare soap solution, wherein the temperature is controlled to be lower than 50 ℃;
(2) Cooling the soap solution to normal temperature, adding functional filler, black water paint slag to prepare composite powder and flame retardant, and uniformly stirring;
(3) And (3) carrying out vacuum stirring and dispersion on the uniformly stirred coating under the negative pressure condition, and filtering by a screw pump with a filter screen to obtain the water-based low-temperature-resistant protective coating.
The application of the water-based low-temperature-resistant protective coating in serving as or preparing an automobile chassis protective coating. The water-based low-temperature-resistant protective coating provided by the application can resist the low temperature of-40 ℃ and has good adhesion, and the coating is not cracked or foamed after the room temperature is restored to 24 ℃.
The water-based low-temperature-resistant protective coating disclosed by the application has excellent low-temperature resistance, corrosion resistance and stone-strike resistance, and has high adhesive force with a metal plate. When the special spray gun is specifically applied, the construction is convenient, the spray can be performed through high-pressure airless spray equipment and spray guns of corresponding types according to construction conditions and packaging conditions, the spray can also be performed directly after pressurized filling, the spray can be performed by using a special spray gun for chassis armor without pressurized filling, and the spray property is good. The water-based low-temperature-resistant protective coating disclosed by the application has excellent coating surface drying speed, solves the problems of low-temperature weather and low curing speed of a high-humidity environment of the water-based coating, can obviously shorten the coating period, and enables the coating to rapidly show excellent physical protective performance.
Detailed Description
The application is further illustrated below with reference to examples. However, the scope of the present application is not limited to the following examples. Those skilled in the art will appreciate that various changes and modifications can be made to the application without departing from the spirit and scope thereof.
The instruments, reagents and materials used in the examples below are conventional instruments, reagents and materials known in the art and are commercially available. The experimental methods and detection methods in the following examples are conventional experimental methods and detection methods in the prior art unless otherwise specified.
The composite powder used in the following examples and experiments was a polymer resin composite solid powder having a particle size of 400 mesh, which was prepared by the preparation method described in CN 107309253A.
The acrylic emulsion A is self-crosslinking elastic emulsion obtained by copolymerizing SH 4700 acrylic ester and functional monomer purchased from Guangzhou Kangyi chemical industry Co., ltd; the acrylic emulsion B is E-1206 environment-friendly aqueous acrylic emulsion purchased from the New Material science and technology Co.Ltd.
The adopted defoamer is a special defoamer for B0319 type acrylic emulsion with high solid content and good heat resistance, which is purchased from the Federal fine chemical industry limited company in Guangdong.
The preservative is 1, 2-benzisothiazolin-3-one.
The film forming additive is water-based environment-friendly film forming additive DPnB of Qingdao sea Lyen chemical engineering Co.
The adopted flame retardant is a special phosphorus-nitrogen flame retardant 3215 for the coating of Qingyuan Daotong chemical industry Co.
Example 1 preparation of aqueous Low temperature resistant protective coating
The composition comprises the following components: 25% of acrylic emulsion A, 25% of acrylic emulsion B, 0.5% of defoamer, 0.5% of multifunctional auxiliary AMP-950.5%, 1.5% of film forming auxiliary, 1% of flame retardant, 30% of functional filler (nano-grade active calcium carbonate), 10% of black water-based paint slag composite powder, and 6% of deionized water according to weight percentage.
The preparation method comprises the following steps:
(1) Sequentially adding the acrylic emulsion A, the acrylic emulsion B, the defoaming agent, the multifunctional auxiliary agent, the preservative and the film-forming auxiliary agent into deionized water to prepare soap solution, wherein the temperature is controlled below 50 ℃;
(2) Cooling the soap solution to normal temperature, adding functional filler, black water paint slag to prepare composite powder and flame retardant, and uniformly stirring;
(3) And (3) carrying out vacuum stirring and dispersion on the uniformly stirred coating for 40min under the condition of negative pressure of 0.7MPa, and filtering by a screw pump with a 200-mesh filter screen to obtain the water-based low-temperature-resistant protective coating.
Experiment 1 Performance test of Water-based Low temperature resistant protective coating
An aqueous low temperature resistant protective coating was prepared as in example 1: because of the different proportions of the composite powder made of the black water paint slag, 5 water-based low-temperature-resistant protective coatings are prepared (the proportions of the powder are shown in Table 1 in detail, when the proportion of the powder is reduced compared with the embodiment 1, the reduced proportion is supplemented by the functional filler, and when the proportion of the powder is increased, the proportion of the functional filler is correspondingly reduced).
The surface drying time of the 5 water-based low-temperature-resistant protective coatings (after being sprayed on an automobile chassis) is shown in table 1 in detail, and the table 1 shows that after the composite powder is added, the surface drying time of the coating has obvious accelerating effect, and the analysis reasons are that the composite powder has larger specific surface area and more developed powder particle holes, so that the volatilization of moisture in the coating is facilitated, the surface drying time of the coating is obviously shortened, the coating period of a client is accelerated, and the coating rapidly shows excellent physical protective performance; with the increase of the proportion of the composite powder, the surface drying time is obviously shortened, but under the premise of ensuring that the spraying operability and the market use requirement are not influenced, the application proportion of the composite powder is recommended to be 10% to be optimal in consideration of the higher mesh number of the composite powder.
TABLE 1 test of influence of the addition ratio of composite powder on the surface drying time Properties of coating
Experiment 2 Performance test of aqueous Low temperature resistant protective coating
An aqueous low temperature resistant protective coating was prepared as in example 1: because of the different proportions of the composite powder made of the black water-based paint slag, 4 water-based low-temperature-resistant protective coatings are prepared (the proportions of the powder are shown in Table 2 in detail, when the proportion of the powder is reduced compared with the embodiment 1, the reduced proportion is supplemented by the functional filler, and when the proportion of the powder is increased, the proportion of the functional filler is correspondingly reduced).
After the 4 aqueous low-temperature-resistant protective coatings are sprayed on an automobile chassis, the test is carried out under the environments of-10 ℃, -20 ℃, -30 ℃ and-40 ℃, the test results are shown in table 2, "×" represents the occurrence of cracking/falling-off phenomenon, and ", v" represents the occurrence of no cracking/falling-off phenomenon.
As can be seen from Table 2, when 5%, 10% and 15% of the composite powder are added, the cured coating has no cracking and falling phenomenon in the test for 72 hours at-10 ℃ and has slight cracking and falling after 72 hours of adding 5% of the powder at-20 ℃; at the temperature of minus 30 ℃, 5% of powder is added for 72 hours, so that the cracking is aggravated and still not fallen off; at the temperature of 40 ℃ below zero, 5% of powder is added for 24 hours, so that cracking phenomenon is generated and the powder does not fall off; after 10% of powder is added for 72 hours, the slight cracking phenomenon is generated and the powder is not dropped; the powder added with 15% of the powder is slightly cracked and not fallen off after 72 hours. Considering that the mesh number of the composite powder is higher, the application proportion of the composite powder is recommended to be 10% to be optimal on the premise of ensuring that the spraying operability is not affected. The application solves the problems of poor low temperature resistance and poor flexibility of the water-based paint.
TABLE 2 test of influence of addition ratio of composite powder on Low temperature resistance of coating
The foregoing examples are provided to fully disclose and describe how to make and use the claimed embodiments by those skilled in the art, and are not intended to limit the scope of the disclosure herein. Modifications that are obvious to a person skilled in the art will be within the scope of the appended claims.
Claims (5)
1. The water-based low-temperature-resistant protective coating is characterized by comprising the following components: 20-30% of acrylic emulsion A, 20-30% of acrylic emulsion B, 0.2-0.8% of defoamer, 0.2-0.8% of multifunctional auxiliary AMP-95, 0.2-0.8% of preservative, 1-2% of film forming auxiliary, 1-2% of flame retardant, 30-40% of functional filler, 8-10% of black water-based paint slag composite powder, and the balance of water in percentage by weight;
the acrylic emulsion A is a water-based self-crosslinking elastic emulsion with the molecular weight of 20-30 ten thousand and the viscosity of less than 1000 cps;
the acrylic emulsion B is an aqueous acrylic emulsion with the molecular weight of 1 ten thousand to 2 ten thousand and the viscosity of 2000 cps to 3000 cps;
the black water-based paint slag composite powder is 400-mesh composite solid powder material prepared by collecting flocculated paint slag sprayed by water-based/oil-based paint produced by acrylic resin, sorting and secondarily flocculating and cleaning, drying and dehydrating the cleaned paint slag, and crushing; the preparation method comprises the following steps:
s1, classifying paint waste residues, and separating large paint residues from the paint waste residues; the large paint slag is blocky paint slag with the longest length of the external dimension of the large paint slag being more than or equal to 30 cm;
s2, uniformly distributing the paint waste residues with the large paint residues removed in the step S1 to a filter pressing system;
s3, carrying out filter pressing on the paint waste residues after the distribution in the S2; the waste water and the paint waste residue after draining are obtained after filter pressing;
s4, crushing the large paint slag classified in the S1 and the drained paint slag obtained in the S3;
s5, drying the paint waste residue after crushing in the step S4;
s6, carrying out superfine grinding on the paint waste residue after the drying in the S5;
the functional filler is selected from nanoscale active calcium carbonate;
the acrylic emulsion A is SH 4700 type self-crosslinking elastic emulsion; the acrylic emulsion B is E-1206 type environment-friendly aqueous acrylic emulsion.
2. The aqueous low temperature resistant protective coating according to claim 1, characterized in that it is located: the flame retardant is selected from phosphorus-nitrogen flame retardants.
3. The aqueous low temperature resistant protective coating according to claim 1 or 2, characterized in that it consists of: 25% of acrylic emulsion A, 25% of acrylic emulsion B, 0.5% of defoamer, 0.5% of multifunctional auxiliary AMP-95, 0.5% of preservative, 1.5% of film forming auxiliary, 1% of flame retardant, 30% of nano-grade active calcium carbonate, 10% of black water paint slag composite powder, and 6% of deionized water according to weight percentage.
4. A method for preparing the aqueous low temperature resistant protective coating according to any one of claims 1 to 3, comprising the steps of:
(1) Sequentially adding the acrylic emulsion A, the acrylic emulsion B, the defoaming agent, the multifunctional auxiliary agent, the preservative and the film-forming auxiliary agent into water to prepare soap solution, wherein the temperature is controlled to be lower than 50 ℃;
(2) Cooling the soap solution to normal temperature, adding functional filler, black water paint slag to prepare composite powder and flame retardant, and uniformly stirring;
(3) And (3) carrying out vacuum stirring and dispersion on the uniformly stirred coating under the negative pressure condition, and filtering by a screw pump with a filter screen to obtain the water-based low-temperature-resistant protective coating.
5. Use of an aqueous low temperature resistant protective coating according to any one of claims 1 to 3 as or in the preparation of an automotive chassis protective coating.
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| CN202211531401.0A CN115710445B (en) | 2022-12-01 | 2022-12-01 | Water-based low-temperature-resistant protective coating as well as preparation method and application thereof |
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| CN116769374A (en) * | 2023-07-18 | 2023-09-19 | 湖北九阳防水材料科技有限公司 | Waterproof coating for metal roof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1456614A (en) * | 2002-05-09 | 2003-11-19 | 吉林科龙装饰工程有限公司 | Low-temperature resistant coating and preparing method thereof |
| CN107309253A (en) * | 2017-08-10 | 2017-11-03 | 泰安乐邦环保科技有限公司 | Paint slag prepares macromolecule resin complex solid powder production technique and production line |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1456614A (en) * | 2002-05-09 | 2003-11-19 | 吉林科龙装饰工程有限公司 | Low-temperature resistant coating and preparing method thereof |
| CN107309253A (en) * | 2017-08-10 | 2017-11-03 | 泰安乐邦环保科技有限公司 | Paint slag prepares macromolecule resin complex solid powder production technique and production line |
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